If he lived in the hotel, then she didn't 'go back to his hotel room' as news reports stated, she visited his apartment. I just think they are different. He could have said 'one of my flatmates is having a party', for example. We don't know it was a hook up. We know that it 'seems' like a hook-up, and that the FB comment feeds that narrative, which is why I'm suspicious of that narrative. He wants it to seem like a hook up. JMO.
As others have said, if she was drugged, she would have been compliant. Those drugs act very fast and she may have been able to walk for some time, appearing fine (even if drunk) to onlookers.
It just feels premeditated to me. My opinion only. And yes, he's been caught, but getting caught might be what he wants. 'Notoriety'. Leaving the FB comment could be a way of him 'leaving a clue' just before he does what he is planning. You could even say the actual words of that comment are another way of saying 'alive'.
Was he trying to make it look as though they weren't together at that time? As someone else said, an Ian Huntley? I mean, there's something odd enough about it that someone on here immediately identified him!
A couple of question for people younger or less married than me:
Could you recognise someone from Tinder and then work out where they are from the App? IE could you use Tinder to stalk someone? Is it true that Tinder has current location information?