Based on their wording I had already assumed that wasn't the case, but here's some some confirmation:
https://www.reddit.com/r/prusa3d/comments/1266bzi/mk4_delive...> So if you ordered the 4 know that those swapping their XL orders have bumped all those that ordered quickly. I was scheduled for delivery next week and now its June.
Placate people you already disappointed for a year by disappointing a new cohort of users. Some companies just do not know how to let themselves win.