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They've done a surprisingly good job of maintaining this scene, actually.
Rebels: Kanan is dead by now, and Ezra would be lost in deep space at this point. Yoda also wouldn't know about either.
Mara Jade: 100% still a Sith Assassin right now. Also not Disney canon or anyone Yoda would hear about.
Ahsoka: This is the best candidate, since Yoda would know about her, and likely regret the decisions that forced her to leave the Jedi Council, making it weird to dispute her status as "Jedi". The most favourable assumption is that he assumes she's dead.
All said, remarkable protection of an Episode 5 made before episodes 1, 2, 3, multiple TV shows, novels, and sequels.
Ahsoka has not been a jedi since she left the order. She's just a warrior who has jedi skills due to formerly training as one.
100%, but ideologically she's every bit as much a Jedi as Luke is here. He's not had any formal induction to an organization, so that can't be what Yoda means here.
Yoda is also shown quite clearly regretting the kind of stagnation he allowed in the Jedi Order, which is exactly the reason Ahsoka was put in the hard situation she was. The Clone Wars very much set up her character as an emblem to show the rot that allowed Palpatine to rise, which Yoda acknowledges and regrets quite explicitly there. It's not a ridiculous inference to assume he respects her and would validate Ahsoka as part of the "good side", which is about all "Jedi" can mean in this context. She even explicitly and repeatedly tries to turn Darth Vader.
Anyway, I do agree in that it's not a massive plot hole or anything, but I'd say that if we're ever explicitly shown Yoda meeting Ahsoka pre-Empire, this scene will be weird.
Last time he saw her, she didn't want to be a Jedi. He has no reason to believe that even if she's alive, that she's acting like one.
At this point Yoda has been isolated for decades, only talking shortly with Obi-Wan.
Didn't she leave the Jedi because she disagreed with the ideology? She even turned down a promotion.
Yoda actually did have contact with both Kanan and Ezra a few times. It's quite possible that he sensed Kanan's death and was aware Ezra was out of the galaxy.