Besides that, they've also guessed a lot of random shit that didn't pan out, such as Russia running out of ammo, Putin being deposed, generals dying for supposedly failing only to magically return to life and recieve honors etc. almost as if they're just throwing out guesses based on the situation. When you've spent the entire year throwing darts randomly at the dartboard, you're bound to score at least a few hits right?
Russia probably has a bit of CIA in it just like the vice versa is true for US and the FSB, but on these topics specifically, no insider knowledge is needed to make a guess. In fact, multiple forumites here have made guesses of different forms of aid to Russia even earlier than Biden spoke up.