I know Bruichladdich has said they do this for the Laddie Classic (a bottling I really love). Source: just trust me bro. I don’t recall when or where I heard that. Possibly they do it with other bottlings, and surely other distilleries are doing the same thing. Bruichladdich didn’t invent the process. But it’s not a well studied, documented, or promoted element of whisky ageing, because, I think, it’s not as sexy as infusion and evaporation. Among other reasons. If you’re curious, I could spin a yarn.
Any distillery that chooses to do this, certainly does it for a reason. Disgorging and re-casking a batch is a massive pain in the ass, and holds up warehouse space & production timelines - two things a bean counter with no sensitivities to flavour would be happy to cut out.
One of the strangest elements of this story is that the Village People and Rufus Wainwright are on the Trump campaign playlist.