No, just the ones who were considered key players in the scheme
The Atlantic and SNY's baseball guy Andy Martino have reported that the Yankees were involved in video sign stealing pre-2018. From a bleacher report article I linked to earlier today:
"Major League Baseball hasn't opened a sign-stealing investigation into the
New York Yankees in the wake of previous comments made by former
Boston Red Sox manager Alex Cora, per SNY's
Andy Martino.
MLB reaffirmed its previous stance on the Yankees after a press conference clip featuring Cora calling
Carlos Beltran, who worked for New York as a special adviser last season, the team's "biggest free-agent acquisition" heading into 2019.
Martino previously reported that MLB wasn't investigating, nor was it aware, of any allegations that the Yankees attempted to steal signs during the 2018 or 2019 seasons.
Martino noted the Yankees did use their video room from 2015 to 2017 to decode signs, and MLB warned them and the Red Sox during the 2017 season that "future violations of this type will be subject to more serious sanctions, including the possible loss of draft picks.""
So
(1) We know that the Yankees were involved in similar shenanigans as the Red Sox pre-2018. Also:
(2) They hired one of the key guys in the Astros scheme, Carlos Beltran. And:
(3) We have the Cora press conference from London where he referred to how Beltran works. And:
(4) We have Logan Morrison's claims.
Independently, NONE of these mean that the Yankees were involved in ongoing video sign stealing after Manfred's memo. But given that we know the Yankees were involved in something pre-memo, and there's at least *some* smoke or at least potential smoke post-memo, it's not at all unreasonable to think that maybe, just maybe, their hands aren't quite as clean as some here are protesting they are.
I mean, again, people vilified the Patriots for deflated footballs. And why? Because (1) they had spy gate years earlier, (2) a ball attendant took footballs into the bathroom, (3) there were ridiculous texts from ball attendants from months and months earlier, and (4) footballs measured at halftime were slightly under the legal psi. Never mind that occam's razor dictates that simple laws of physics were responsible. But that was enough to launch a months-long investigation and have the premier player in the NFL suspended four games and cost the Patriots two draft picks.
Different sport, different commissioner, different situation, yes. But there's easily as much smoke surrounding the Yankees here as there was surrounding the Patriots in 2014, if one is going to be objective about it. Might mean nothing, because I'm 100% convinced the Patriots did nothing vis-a-vis deflate gate. But it's not unreasonable to at least.....wonder.