That means scarcity and scarcity increase value, so Bitcoin is about to break new ground after much talk about the 2017-2018 bull run.
It contradicts with the current Bitcoin price

Bitcoin price should be higher than $30K because when the price was hit $30K on the previous month, the fees is still cheap and you can still send 1 sat/byte. Scarcity could increase value, but it's need a demand too.
Sorry but where to check there are 400k blocks waiting in mempool queue?
I think he meant about unconfirmed transactions.