Hmm, that is strange. I bought my Start/Stop device from Range Technology last August for my 2019 Regal Sportback (4 cylinder). This was after I emailed them to confirm it would work on my car. They assured me it would, and the drop-down that listed available vehicles was actually for the gas saver device (because that device shuts down several of the cylinders).
The Start/Stop device has worked perfectly for me since then (12,000+ miles). But I now see that Range Technology has changed their website since then and it theoretically does NOT cover my car anymore. It does appear to be the same device however. Has anybody emailed them asking for a clarification as to why it changed from last year to this year?