The current infrastructure cannot handle the new load requirements. Either the infrastructure must change, or they must start denying users the ability to use the infrastructure.
I may have come out with a different interpretation than you did of GP's comment. I see how you got to yours. But the way I read them saying they should slow down was, maybe slow down on new features. Which would mean they could shift resources from new features to infra.
The current infrastructure cannot handle the new load requirements. Either the infrastructure must change, or they must start denying users the ability to use the infrastructure.