They're still walling-off content from consumers who would gladly (mostly) pay for it. But you're right, it's not quite the same - because this is punishing players who can't find the time to play the content before it disappears.
Honestly, no way anyone can tell me this is objectively okay. If it doesn't bother people, that's fine (really), but you can't tell me that it's a reward for Season purchasers, when I've missed that "rewarding" content due to having a life. :/
I only kinda take umbrage with the first statement here, because there were a lot, and I mean a LOT of people who were
not glad to pay for it. There were (and are) tons of folks on the "wait for physical" train ever since it was first announced, so it seemed obvious there was some stuff they were going to miss out on, and that was something people were going to have to be okay with.
Personally I've missed a couple elusives as well, since I ended up taking a break from gaming for the last few months, but I don't have any expectations of going back to play that content. It's no different than a live event in an MMO, in that it's there for a little while, and then it's gone.
I don't know if anyone could say it's "objectively okay", because personally I'd like to replay the elusives as well, but I would say that it shouldn't come as a shock to anyone. There have been a lot of miscues, miscommunications, and problems with Hitman's delivery, but the PR behind Elusives as being "you only get one shot and then it's gone forever" has always remained constant, ever since they were first announced. The only obfuscation of that fact has been from hopeful fans, never from the developers.