I don't think it was a shot at Rondo, Irving didnt even get 40 did he? I think its a shot at the refs because he couldn't guard him due to the whistle. It's just a you're lucky I wasn't able to guard you..type of aimed at Kyrie. It seems like that at least.
I thought it'd be something you'd say after getting ticked off at the refs. But if the media take it as a shot at Rondo, no way you can say "no, I'm calling out the refs" because that's just asking for a fine!
So he deleted it. Makes it seem more dodgy, but really the only right move.
No smoke, no fire.