The key word in the opening statement in that post is that they inquired "at some point." The discovery of this is new, but that's it. Might be very old news. And it means absolutely zero in terms of the Brewers' interest in listening to SD or trading Frelick -- just that the Padres like him, which is pretty much non-news.
As a buddy of mine noted, Jesse Winker just signed an NRI deal with Washington. SD has like 2 legit OFs and even they didn't want him (and I don't blame 'em). . . . Point being, a) if SD's OF is indeed that lean on quality, it's natural that they'd have interested in anyone decent & cheap; and b) even if they're that desperate, that they'd pass on Winker, if nothing else, indicates that they at least have a half decent notion of quality. . . . Brains, budget, & sufficient attractive MLB-ready assets are different topics entirely -- To wit, I still don't get why they'd include a not-too-costly Grisham in the Soto trade to NY.