In my 4 decades IT career I have never heard of this term for a paid and active version of any software, and this term "as-is"
"As is" means that the seller is selling the item in whatever state it is in at the time of purchase,
and the buyer is accepting the item "with all faults," whether or not they are immediately noticeable.
Moreover, your statement above "as-is" is the complete opposite of what IPS management has promised in this announcement.
Invision Community 4
Announced
March 2023
Removal
2025/2026
With the release of Invision Community 5, we will begin the process of stopping support for Invision Community 4.
This will of course be a long process and we will still provide support and security updates for Invision Community 4 until final end of life.
You are stating that IPS will no longer fix any bugs from "deprecated functionality" in version 4, even though the announcement above stating that support and security updates for Invision Community 4 will continue until the end of life. Is it not enough that we have been incredibly patient in fixing bugs that have been reported for years and months?