This seems plausible, but has there been any official confirmation?
If I'm Elon, my next act of ecosystem warfare is to monetize remaining API use cases to within an inch of their life.
The new wording in the terms forbids "use or access the Licensed Materials to create or attempt to create a substitute or similar service or product to the Twitter Applications".
If I had a Tweetdeck competitor I'd not be investing too much into it, and I think anyone working with the APIs now has to do a bit of "is it worth the risk?" calculus, but at the moment there's no sign this goes beyond third-party clients to consume/post timeline stuff.