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The Bloomberg playbook in '18 often involved striking very late. Most of the time, they didn't show their hand until they played it. And why should they? There's plenty of evidence that late ads are most effective. Striking late means no opportunity to organize a counter.
That's quite different, of course, than the Bloomberg 20 primary: just blanket the ad for five months before Super Tuesday. And there's no reason they couldn't have done that in the general, and go on air in the big six in June or something
But there's also no reason they can't still do the 2018 move: identify the places where a) ad spending is most limited, b) where you think you think a push can get you over, and then strike overwhelmingly, as late as possible.
There's really no reason at this stage why Bloomberg couldn't do the 2020 equiv of 2018: pump 400m into TX/GA/OH/Miami media market or something over the final three weeks. And if he was going to do that, why would he say so now? That would be a colossal mistake
Anyway, I'm most certainly not saying he's going to do that. Who knows! But I do think it's quite keeping with what he's done in the past, and it wouldn't be ruled out by his inaction to this point--to the contrary, they'd have every reason not to move until the last second
