It’s a tarpit. If they simply displayed a blocked “no vids for u” message, you’d get outraged, go complain online, look for workarounds, and eventually find a bypass. If everything still works but poorly, you get annoyed, turn off your adblocker to troubleshoot, possibly blame the adblocker for being “buggy” and keep it off. Their help page solution implies they are hoping for just that. There is no “smoking gun” blocked message to go complain online about, even though it is indeed their servers that are degrading your connection on purpose in secret. Or maybe you give up and leave their ecosystem entirely, which is no big loss for them.
The proper solution is to develop an adblock that they cannot detect is blocking ads. This may require actually downloading the ad video in background, and then lying that the video has played.
An aged account is not even a panacea. I had a reddit account of many years that I haven’t logged into for the last two. I check online, it still exists, in good standing. I login one time, post one helpful comment (through a VPN of course, same as I always did), try to log in the next day to check replies - login error. Check through a third party - account page no longer even exists. All comments completely wiped. Thanks reddit! Saved me the trouble of deleting my account manually.