Apparently they still hope to make a bit of money out of it:

"I never had a license! Well, even then you can have one - if you absolutely want to. . Depending on your bid, we will then contact you." https://tempus-word.de/en/download/index

I guess they found out they make out more that way than setting up a ko-fi account. It also insures the soft and its legacy doesn't become bloated over time. It is also possible that given it uses old tech (GEM) and probably assembly code, the software as it is would not be more easily portable than it is now using emulators.

I think that's out of date. The banner at the top of the page says "you can request a free license for version 5.4 from us." According to archive.org that was added later than the text you quoted, somewhere between 2022 and 2024.