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That is the claim of the post. I also don't see confirmation elsewhere

There is very little information around, this is the most authoritative post I could find. There are some comments on X as well.

According to this blogpost, he sadly passed away last Thursday, March 5th.

There were a few recent edits about this on Tony Hoar's Wikipedia page which were reverted because there was no substantial evidence: https://en.wikipedia.org/w/index.php?title=Tony_Hoare&action...

It was edited again a few minutes ago and now displays Sunday, March 8th as his date of death.

And it's gone again!