I think this advice is great, but the wording they use causes people to miss the point. Specifically the word "launch". You don't need to have a big marketing launch, you don't need to do ads, you just need to get it in front of customers and validate your business by whatever means you can (whether checking whether consumers come back or asking people to pay, or whatever).

The struggle is that people think "oh, this needs Slack-level design" or 'just another feature', but if they thought of it not as "launch" but instead "put this in front of customers now and get feedback", it would be more obvious that this was a good thing.