It says "one time payment" but then it says "2 years of updates".
I interpreted that as having to pay a second time two years into the future if I will want another two years of updates then. A bit misleading.
It's similar to a lot of pricing plans out there. For example I purchased Home Designer Pro 2022 a couple years ago for $450 and I can use the HDP 2022 forever. They have, of course, HDP 2024 but I can't use that one. I can upgrade for an upgrade price. However I don't need to upgrade and am happy to just use 2022 for the rest of time.