I think it’s huge, too - if it turns out to be true. I don’t think the Telegraph made it up, of course, but it could be that the Cardinal, who is not a native speaker of English, meant it more as a projection of what he hoped would someday occur (every parish in England will have a Gregorian Mass) than as a direct order from the Pope.
On the other hand, maybe it actually is the next step, and the Pope is going to mandate all parishes to have a Gregorian Mass within a certain period of time. IMHO, that’s the only solution that’s going to work, because the bishops are so resistant. And this would affect not only England, naturally, but the Church worldwide, including the domain of the USCCB.
One can dream...
I think the odds are he meant what he said -- the article says it was a press conference, presumably a scheduled one that the Cardinal had prepared for and likely called himself. Much as many of us here love him, he doesn't exactly have rock star status with the press and most likely isn't shadowed by papparazzi. Some might seek him out to comment on "news" -- but the only news is what he said in the press conference!