Two more factually untrue statements. Every counter is not tossed. Card counting is alive and well and there are still many, many successful card counters, ranging from recreational right up to professional. It is true that to achieve longevity as a card counter you have to alter the approach from 30 years ago. You can't just pull up a chair and sit at one table all night long spreading like it was the 1980's. You have to play shorter sessions and move around a bit more. But there are many successfully doing so, especially if you can identify what levels of play are better tolerated at different casinos and times. But despite that there are many successful CC's playing, you will believe what you want (earth is flat), so go to it. Your alternative universe must be an odd place.
As for counting two tables....more of your "earth is flat" idealogy. I track multiple tables almost everyday. Not every time I sit down, depends on the situation and conditions, but most days that I play, which is 5-6 days a week, I have one to several opportunities to track multiple tables. That hasn't been disproven. It can't be disproven, because I do it regularly. I think what was proven is that 67 year old Alan Mendelson, can not track multiple tables.
And frankly, I am not even convinced that was proven. I think even Alan could probably do so if he really tried and had a desire to. But he went into his little exercise looking to prove and confirm his own pre-existing beliefs or hypothesis. That is know as 'confirmation bias'. It is associated with 'wishful thinking' and it is widely accepted that such exercises are deemed completely invalid and irrelevant.
Bottom line is people of the closed mind club, like you and Alan, do what you need to do to justify your alternative reality and universe.