The dealer that I finally placed my '22 F-350 Lariat order with last week, (as was the case with others I spoke to), was charging MSRP, with the only discounting being any factory rebates/incentives currently offered.
Upon discovering in the 9th inning of the process that X-Plan was offered through my wife's employer, the dealer gladly accepted it, in addition to any Ford incentives that may become available before delivery day.
The X-Plan discount was sizeable, and I'm pleased with the final price!