No way. Yhwach commented on his absurdly high Reiatsu, meaning it hasn't passed the arbitrary threshold at which point overwhelming power can no longer be sensed.
I don't think so. Aizen can sense ichigo's reiatsu from SS while ichigo was in Soul Kings Palace fighting YH. Also all of ichigos friends could feel it, But dangai ichigo had his reiatsu sensed by neither aizen nor his friends. Aizen may have gotten stronger since then, but I don't think he evolved beyond dangai ichigo.
There is the possibility that that whole thing was retconned but without further evidence, i don't believe that. I really wanted ichigo to be stronger at this point, but nothing he has done is nearly so impressive as that he did in dangai form. Ichigo wasn't destroying mountains casually. He did destroy YH's palace but that wasnt exactly casual.
Didn't Ywach straight up say that ichigo regained the power he lost against Aizen?
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Whatever that is supposed to mean... But I wouldn't call dangai ichigo his true original power, especially in Mugetsu form. And I think the "growing stronger" part, is only in comparison to his strength when Ichigo fought YH after Yama died. Unless you are thinking of some other time?
His raw strength seems to be way below.
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Yh i dont disagree with that the power that he got back was his hollow/shinigami and quincy power the level it was at is just above Vasto ichigo that fought ulquiorra at least that where i place himI don't think he means the same level of power, but just merely the shinigami abilities because it shows ginjo etc. that arc was to make Ichigo back to old pre dangai form strength