First off, the Harada tweet means nothing, the guy is a known troll.
Second off, how does this do anything towards Crash's chances? Especially a deconfirmation? I mean, my comment was a joke.
Wait it was Joke?
In any case, The Logic is that Sakurai wouldn't be Posting References that Deliberately reference Characters or the Game the Character was from if they were playable. Of Course there's leeway with that because the Stage Builder Video had a Dragon Stage and Witch Stage, probably references to Hero and Banjo, but beyond that Sakurai really only makes references to stuff the day before
IF that's the Case, it's possible that Arle and Ryu would also be Deconfirmed as Playable.
However like the Dragon Stage and Witch stage show, It might have leeway, but still...
As for the Harada Tweet, he may be Troll, but the Logic with that one is that Harada might have known who would have a Role in FP2, especially since he didn't even Mention other Characters that were involved in the Tweet.
Jonsey, Doomguy, Master Chief, Gordon Freeman, Crash, and Arle were mentioned. Doomguy is Soft Deconfirmed, Chief is probably soft Deconfirmed as well. Jonsey and Gordon Freeman is technically not Soft Deconfirmed but there really isn't much pointing towards them even contacting nintendo. The Puyo Puyo Twitter is not making Arle's Chances for Smash look Good, and Crash is an Enigma
I'm Just Spitballing. I Don't actually think this Deconfirms Crash, or Arle or Ryu