Amusing. They claim to have 'incontrovertible evidence' that it wasn't them. That is literally impossible, unless they have incontrovertible evidence who did it and that that party did not acton their behalf.

E.g. if their proof is that these claims were sent from a gmail address they would need to be able to either identify the actual sender or prove that none of their staff or agents could have access to that account.

Also pretty amazing they admit it’s happened before. Yet

https://web.archive.org/web/20210526232505/https://twitter.c...

Yet their dmarc is still set to p=None

https://mxtoolbox.com/SuperTool.aspx?action=dmarc%3aOpsecsec...