Besides zero evidence, here's why you don't just sail to the Gosford Glyphs

The old shipwrecked Egyptian sailors story looks more ridiculous when you look at a map, but first could the Egyptians even get here ?
Probably not as they mainly used their boats on rivers and close to the coast in the Red Sea, there is records of them making it as far as Ceylon once and they had to call on the Phoenicians to circumnavigate the African continent.
Even if the Egyptians land hopped along the red route in the map they would have landed somewhere on the north western coastline.
Another whatif scenario would be using the Brouwer route (yellow route) which took advantage of the Roaring 40's wind that made for a quick but dangerous journey skirting the Southern Ocean would have the vessels land along the west and southern coast
To make it to the east coast along this route would be the most dangerous part of the journey especially through Bass Straight an up along the coastline, when Cook circumnavigated Australia he failed to find the straight and early maps show Tasmania connected to the continent 

Glyphs located at orange star

So lets say they made it thus far and then proceeded to partly circumnavigate the continent for some reason, the red route bypassing the entire north shore line and New Guinea and making it past the dangerous Barrier Reef  before finally making it to Broken Bay NSW
The yellow route finding the mainland after surviving the roaring 40's and the treacherous southern coastline before finding a route along the east coast of NSW

East Coast of Australia, the glyphs are located north of Sydney

One would think at any stage before this our adventurers would have made landfall ?
Anyway lets keep being silly and we are now in Broken Bay at the mouth of the Hawkesbury River, lets now bypass any number of safe landing places and fresh water sources and navigate thru a dangerous surf and sandbar formation to enter Brisbane Water and again ignore a number of safe landing places to keep sailing into Woy Woy inlet.
Or maybe they were shipwrecked as they say and walked on foot from wherever they were and scaled the hills to reach an obscure rock cleft (red star in pic) in the middle of the thick bush, again ignoring better places to make camp and find fresh water.

Broken Bay NSW Australia

Not only it is unlikely that anyone coming from the area of the Red Sea would make it to Australia's shores 4500 years ago it is also the furthest point away from Egypt on the Australian coastline

yeah nah.

AAP Factcheck finally gives a finding

AAP Factcheck team sprang into action after a Facebook post tried to discredit the Maori people of New Zealand by mentioning the glyphs as an example of earlier visitors to the region
The article title is gold 
More here https://www.aap.com.au/factcheck/believers-of-fake-gosford-egyptian-hieroglyphs-are-in-denial

Remedial rock works at Gosford Glyphs cause hysteria

The National Parks and Wildlife Service undertook works at the glyphs site this summer as geologists had noticed one of the overhanging rocks was moving and could possibly fall into the crevice where people could be standing.
A large boulder that was holding on by a thread was removed slowly while not damaging the carvings.
Some people were convinced that the council was destroying the glyphs and the internet forums went into melt down with wild rumors and the expected conspiracy BS
Some humble pies were eaten when the site was inspected soon after and no damage could be seen apart from the large boulder gone and the crevice floor leveled out and made a bit nicer to walk on for the not so hardy

The overhanging rock that was threatening to drop onto visitors NPWS have a duty of care to ensure this cannot happen

The sign was posted for months at the site advising of oncoming works