These are not addressing the block size scaling constraint. They are just referring to how fast nodes can verify transaction signatures. The former is the bandwidth elephant in the room and can't be scaled with existing consensus technology unless the mining is centralized on fiber connected servers.
In fairness there are many fiber connected homes now. Not everyone and not everywhere but it's become fairly common.
Such "fiber connected homes" (smooth) would achieve relevance in "[Bitcoin] mining" (TPTB_need_war) through
P2Pool, which
is not "centralized" (TPTB_need_war).