An update:
Victor Iannello, AJ4AQ, comprehensively debunks the idea that WSPR data can be used to track aircraft over long distances in his article here:
https://mh370.radiantphysics.com/2021/12/19/wspr-cant-find-mh370/
He asked Professor Joe Taylor K1JT, Nobel Prize laureate and inventor of WSJT/WSPR protocol for a comment on the material covered in the article. Here was his response: "As I’ve written several times before, it’s crazy to think that historical WSPR data could be used to track the course of ill-fated flight MH370. Or, for that matter, any other aircraft flight… I don’t choose to waste my time arguing with pseudo-scientists who don’t understand what they are doing". Pretty conclusive I'd say.
de M0WWS
https://www.qrz.com/db/M0WWS
Post by Gareth Paleyhttp://youtu.be/Jq-d4Kl8Xh4