He hasn't made many posts on twitter, as most were on reddit. I don't think he ever said about a swap deal for Sanchez at all.
This was his first twitter post
/u/xisimon @u_xisimon May 10
Summer 2019 - Update 1: Lingard on thin ice. Sanchez hard to shift because of his wages. Big summer upcoming. Mostly signings with potential, with a few senior heads. Next season is a transition season. Daniel James. Close. Koulibaly. Making progress.
Who knows if we really were in for Koulibaly??
The rest sounds very plausible, and James happened.
But we'll never really know, so can only be glad it sounds like we've made a big signing.