The original post you quoted, from days ago, was directed at someone who was, in a rather mouthy manner, convinced that the Blues were going to finish bottom-1o. I questioned why, and laid out evidence that suggests otherwise and made me raise my eyebrows at that claim, and got no response. That was all I was originally arguing.
You then responded with a post that shows how stellar Binnington has been during a stretch which is ~75% comprised of an 8-game-winning-streak (not sure if Allen has started any/how many he has), which I completely agree is completely unsustainable, as the NHL has never had anything close to an 82-0 team.
I then reiterated, from the perspective of the post I replied to when I made the first one, that it is unconvincing that just because Binnington is playing hockey right now at a level he won't be playing in March, necessarily means the Blues are due for a bottom ten finish, because there is a lot to like about every aspect of their hockey team, and they can absorb league-average goaltending and still win a lot of hockey games with the hockey they have played since early December, or for two and a half months now. This is my contention, nothing more, nothing less.
Allen sucks major donkey balls and has for a while right, and their record before the change is both indicative of his inability to stop pucks and the fact that, as I have noticed via watching ~10 blues games and their fans have been insistent about, hockey teams do not play good hockey in front of goalies they don't trust. That description of past events does nothing to convince me of the original dubious point, and if anything, the fact that Allen's bad stats during this good stretch coupled with a way-worse record than Binnington just reaffirms that the blues struggles earlier had far more to do with him than any inherent roster problems, though they are far from perfect like any non-Tampa team.
Say Binnington/their goaltending plays the rest of the year with a save percentage varying somewhere between ~12th and ~22nd in the NHL on a team-wide scale. Average, some good weeks, some bad. Would that sink them out of the playoffs in the west, and to a bottom 1o NHL finish? I don't think it would. Could he falter and have their team goaltending revert to the bottom 2 disaster it was with Ocho/Allen? It definitely could. I think it's far more likely that the former scenario plays out though, and they've basically been a machine in front of their goalies for 2 months now, so I still question any hard claim that they're a bottom 1o hockey team. And even if he's a flash in the pan, the schedule is getting short enough that in the worst case scenario (him falling apart) doesn't drag on for months and months.
TLDR I mean yeah blues goaltending could become a lot worse again, but I wouldn't throw money on a mean-regression from worst in the league as a warning sign that the goaltending will soon revert back to an equally severe outlier where it already spent months (with a goalie that isn't on their team anymore playing a part as well), especially with how good the D has been in front of the goalie and how good that goalie has looked, and would heavily question claims that it'll not only happen but in such a manner as to severely tank the team in a short time span, put forth with no evidence or explanation, certainly not one that even MENTIONS goaltending.
