You are correct. As usual, clvderp is very limited in his knowledge about roster construction.
The Braves will almost certainly make an effort towards building a deeper roster 1-25, and a LHH IFer like Descalso is something they should be trying to acquire.
Whether or not he will be made available, or if he is the best fit for an expanded bench role is certainly open for debate, but guys like him will certainly be of interest. He is actually one of the names I had in mind when I said, "I would not dip into the FV 55 guys for him (Peralta) unless other MLB pieces came along in a package".
Again, clvderp can't read when he suggests the thread title is misleading. The quoted tweet literally states, "the Dbacks expect to strip down the team and rebuild, with virtually everyone on the trade block".