Why is PS5 still sold out? ?

Bought it thats why

Pent up demand.

There are people using bots to buy things. PS5 scaplers.  

Because people have nothing better to do, especially with COVID, so they waste their time and LOTS of money on Gaming. Nothing wrong with games, but now it's just ludicrous. People need to grow up and spend times with their families. Spouses, kids etc.

https://wminecraft.net/minecraft-forge/

Pent up demand.

People kept buying them. Some gets very lucky, but a good chunk of them is probably being bought by bots who’s intention is to resell them on amazon and eBay for nearly double. You just know there’s that chump who’s willing to cough up that much because they want to hurry it up with getting it and felt it’s the cost of not wanting to deal with the nonsense of lines or waiting for online queues with the possibility of getting one in time. 

demand is exceeding the amount being produced

It's all a marketing plow or maybe it's not? Maybe something or another?

More people are buying them than are available. It is really not a difficult concept.