I think if you are a publicly traded company you are even required by law (at least in Europe) to publish information about the failure of such an important acquisition as soon as you learn about it.

Edit: see for example Art. 17 of the EU market abuse regulation.

It was a political statement by POTUS to block and then later allow extension period for the sale of ByteDance to Microsoft. This is a political statement back on the results of the agreements. It is responsible that Microsoft publically posted this official notice, in addition to however else you may find it.

I don't think they're being as coy as the phrasing "in a way accusing" suggests. This is a very direct accusation that Bytedance is not on board with changes for privacy, security, etc.

with changes Microsoft claim to be for privacy, security etc. to the public.