If there is a chip shortage then Shouldn't be a shortage even on older chip?
Explaining the chip shortage is weird. It's not that the resources to make them isn't there, more there isn't enough people in the factories to make them due to COVID.
Most likely because of the age of the Maxwell chips, they were made before the factory shut down and are just being delivered at this point.
As for Switch Pro, there is no Switch Pro. Like I said in the thread rumoring it's hardware, that would be more akin to a Switch successor, not an upgraded variant. If a Orin or Lovelace based Switch is on the horizon, it'll be a successor and not a pro. The OLED is the closest you're getting to a Pro.