i didn't say it is your claim, that way of thinking is a silly way that has existed before SegWit even started and it is true but not possible! basically it is an FUD that was designed to prevent SegWit activation. it is true that miners can decide to steal SegWit outputs but in order to do that they have to fork bitcoin and be on a new/different chain which the rest of the network will never follow! and also this possibility is true about all other outputs when a fork is the first step. so it is not even SegWit related.
to explain. segwit would need to be deactivated and regress the rules back to 2016 rules. thus making segwit outputs become 'anyonecanspends'
which is the worry if there was a bug. where anyone sending funds from segwit addresses could be spent by mining pools when pools add them to their block in such an event.
the same thing could have been said about any new output that is introduced in bitcoin such as pay to scripts. and these things aren't just added overnight. it is extensively tested and reviewed by many developers.
you are very wrong.
if you want to know how trusted SegWit and its addresses are you need to check the code not what some dudes are doing no matter who they are.
not to mention that the reason for them not changing their "donation" address can simply be because a lot of wallets don't support SegWit addresses! or simply because nobody donates anything to that address (received 5 tx in 7 years!).