So, just like with the Co-Redemptrix, Prevost carfully dances around heresy.
Unfortunately, it's easy to start shooting from the hip and declaring him guilty, but there's nothing strictly heretical in anything he said here or with Co-Redemptrix.
1) with Co-Redemptrix, even pre-V2 theologians said the term was confusing because it required much explanation to avoid misconstruing the force of the prefix "Co-", and that's all the Tuchonian note said. In a later clarification, he even said that it may be used in private, but not in the Church's public liturgy, again, due to the confusion it might cause
2) with this here, nothing Prevost says is incorrect. Note that he refers to the Nicene-Constantinopolitan Creed NOW not having the Flioque. That statement is factually correct. It is in fact correct also that the Nicene Creed did not originally include the Flioque. He's distinguishing the Constantinople version of the Nicene Creed from the one used by the Roman Church. He rightly indicates that it was inserted by a certain Pope in the West.
So, the mere fact that they're in "dialogue" over the point indicates that there's no agreement on it, and suggests that they have not simply conceded the point. Yes, these statements can be considered scandalous by failing the condemn the Orthodox's heresy and implying that it might be merely "different point of view" rather than objective error ...
but in both these cases they do carefully dance around explicit error.
It's a shame that Trads are so desperate to find the heresy among the Conciliars because ... their main heresy that they practically advertise on their foreheads, and repeatedly teach ... is denial of EENS dogma. But, alas, most Trads have fallen into that same heresy, so they're desperate to find some other explanation for the Conciliar heresy. Look, it's Religious Liberty, or Co-Redemptrix, or Filioque, etc. ...
No, it's EENS-denial, stupid.