Because even just 4/5 months ago Charlie was still very much one of the few people willingly to stake their reputation on saying that property prices would go down.
He's been ridiculed repeatedly and still is, but when posters wanted to point people to another point of view other than "house prices only ever go up" & "interest rates will go back down again soon" he's the ideal YouTuber to point towards.
He's far from perfect and likes to waffle on, but he'll admit when he's wrong. I along with many many others am glad to hear someone openly saying 8 months ago what I was thinking might hopefully happen.
Charlie (and Alex) may well be just a couple of guys from HPC forum who finally timed it right, but they do appear to have solid data for his reasoning.
And Martin Lewis has never said he's a property expert, money saving yes, property not so much.... in fact so many times when I click on martins tweets I get a "this tweet has been deleted" message