Hello,

Where are new web link of

https://invisioncommunity.com/4guides/suite-applications/pages/tips-tricks/advanced-using-pages-under-your-community-root-r244/?_fromLogin=1

Did this page even exist before?

Yes

This functionality was deprecated quite a while ago and isn't supported.

You should have your Invision Community install at the root instead, with the Pages application set as default.