Nice crabwalk you're trying there, except you didn't say Biden was the worst president since that period started and somehow trying to make it sound like the "since" qualifier isn't establishing a stop gap. Sorry, but no one's following your logic were past presidencies magically disappear. https://www.wallstreetenglish.com/exercises/the-difference-between-since-and-for-english-grammar-with-exercises#:~:text=We normally use 'since' with,ve worked here since 2008.
So your link --- demonstrates exactly what I stated -- "since Trump" means the period time between the past mentioned (Trump) and the present -- not inclusive of the past event. Which means your statement implies Biden is the worse President in this time. Text from your link We use ‘since’ in front of a finished point in time in the past. For example: since June since 10:30 since last Tuesday
"worst death toll since wwii" "best finals since bulls vs. phoenix" just admit it was a dumb pun that nobody would pick up on, or worse an attempt at a save instead of arguing w/common practice parlance.
In the era of social media, people of the same "social view" just like to chime it in. Only time can tell who's right. When Reagan moved into the WH, he ripped out the solar panel that Carter installed. Just look at all the Bob Lutz's comments of TSLA. The people of USA put him there. It's a process of electing more than 40 presidents. It's who he is. IF you as voter, don't like him, don't vote for him in the next election.
Also, follow the democrat playbook and try to impeach him every chance you get. Yes, elections occur every four years. Nevertheless people who care about their country should be speaking out every day that a president is in office- whether dem or repub or whatever- on important issues. This is the wrong time - as every time is- to just say if you don't like what the president is just deal with it three years plus down the road. Nope, today and everyday is the day to speak out. I believe that was always the view toward Trump as well.