That doesn't give the full picture though - there is more to consider than just the price, interest rates affect affordability too, a lower price to earnings ratio might help with regards to the deposit but at the start of that chart you'd be paying circa 14% for your mortgage whereas you can be paying circa 2% these days... perhaps total cost of the typical mortgage at the time vs earnings might be a more interesting chart to look at.
Mortgage interest was circa 10% at the start of the 90s, they bounced around between 5% and 7% ish through that decade but by the end they were at 5%, mortgages became more easily available in the 90s too.
I don't doubt that in spite of that housing would still likely be less affordable in general these days, but the seemingly big differences in affordability might not be quite so significant... (the late 90s were clearly quite a nice time to buy!).