This is way too reductionist. These aren't just "Musks tweets", they are directives about employee policies that are publicly stated, but not private enforced (because, to the author's criticism, they have no strict definitions). Furthermore they have clear (or at least implied clearly) repercussions: "don't behave they way we want to or you're fired".
> all could be considered about working conditions.
Actually, I think what the author is asking for is clarity about working conditions, not necessarily the working conditions are good/bad - they're just ambiguous.
This is backwards. There are lots of rules out there which I'm sure you dislike. Therefore your dislike of this one is irrelevant.
And I say that despite agreeing with you about how it might be abused. And despite wondering whether the people calling for more diversity and exclusion in this letter may be the kind of people to abuse it that way. Rules are rules, and we should try to apply them fairly, especially when applied to people we dislike.
Maybe those companies shouldn't include statements like this in their corporate filings then:
"The Twitter account @elonmusk is considered an official corporate communication channel."
Especially when Musk is tweeting from it things like changes to remote work policies.