I'm not sure if the correct takeaway here is "unlearn how to hack systems" but something more akin to "prioritize the right hacks you need to do".

Making a good product (with whatever shortcuts/hacks come with it) is necessary for doing well. Getting exposure and launching on a Tuesday are neither necessary nor sufficient, but they will give a marginal edge.

Both the former and the latter are 'hacks', the only difference is degree of relevance. pg throws the baby out with the bathwater a bit by saying don't do both types of hacks.