What he probably means is that pruning does nothing to increase transactions per second.
But it's helping with the management of the bigger blocks which indirectly help the increase of transactions per second.
You're not transmitting those pruned blocks. You may also be pruning important metadata and destroying part of the Bitcoin ecosystem.
He doesn't care. Having to trust centralized
master archive nodes is a small price to pay for his dream of achieving maximum Bitcoin monopoly.
Because God forbid retail consumers don't use the same tool to buy coffee as financial institutions use to settle million/billion dollar deals.
In Roadkill's feverish mind, even the suggestion 'perhaps an altcoin would better for using at Starbucks' makes you an evil shill.