Yea, I tried this and not only did it not fix my Apple Watch syncing issue, but I also had to reenter all of my Reminders - not one of them came back to the phone. If I log into the Reminders iCloud web app, I can see them...sort of (they are all missing the dates, times, and recurrence information), but they did not sync back to my phone. Luckily, I screenshotted everything first. I re-entered all of these (took a while), now in iCloud I can see both the old ones (no info) and the new ones (with the correct info). None of these sync to my watch.
In fact, I think I've tried every solution on here, none of them fixed the Watch sync issue (Series 4, FYI).
Curious, in the Apple Watch app on my phone (11 Pro Max), I don't have a Reminders app listed - meaning, I can't adjust settings or uninstall the app from my watch. I even tried deleting the Reminders app from the phone, re-installed (which BTW, this time my Reminders did come back, thankfully), but still no Apple Watch app listed for Reminders. Is this true for everyone?