I kind of get the idea behind the digital picket line because a great deal of promotion of universities is done via Twitter through people promoting their brilliant grants, articles etc. so it's kind of free promotion for universities about the great stuff they've got going on.
However this isn't the reality of how Twitter is used by academics (because people post critical stuff and also behind it's like shouting into a bin bag given most academics are only following/followed by other academics who can see through the bullshit).
A true digital picket would, I think, be all university staff completely staying off Twitter for the whole of the strike period. Not tweeting about work or the strike, just silent. The irony is, of course, that many people are tweeting about teach-outs during the strike which, as I've said above, plays right into universities' hands because many teach-outs look and sound amazing so it's just more free advertising for universities. I've made this point above - teach-outs boil my piss.
But, yes, basically, performative, bullying nonsense.
That article on Grady is very interesting. I have many issues with the DM obviously and I feel slightly uncomfortable with their semi-sexist presentation of Grady (e.g. calling her 'Miss' when she's 'Dr') but you're absolutely right that there needs to be transparency in all of this.
On a side note, I was part of an email chain yesterday with 7 people (including me) involved in back-and-forth emails. Five out of the seven of us had 'I am on strike auto-replies on'. Absolutely being used as quasi-research leave. 