I think people are being a bit overly critical tbh (probably a reaction to obsolete's language use e.g., "for noobs" "non-experts" etc., but tbh that is probably a reaction to people who were calling HIM a noob, or inferior player, for NOT lightbulbing, building cottages, etc.!!!).
Is this a strategy that can work for every leader in every situation: NO!
Is there any strategy that can work for every leader in every situation: NO!
Can this strategy work for a non-industrious leader: probably not, unless you have stone and/or marble, preferably stone
Can this strategy work without stone: YES!
HOWEVER: Industrious leaders are a non-trivial amount of the # of leaders available. High-production capitals DO happen, although not always. Stone DOES appear, although not always.
CONCLUSION: When you ARE industrious, and DO have stone, and DO have a high-production capital...well here is a strategy you can pull out of your arsenal!!! Do you have to COMPLETELY avoid cottaging and lightbulbing? NOOOO!!! Obsolete himself admits he is NOT completely rigid in his own offline games, but played with these restrictions for our benefit to show that it is POSSIBLE. Is it the MOST EFFICIENT way to go? Probably not. But in your own games, where you are using this strat, you can tinker and add as the situation dictates. You can lightbulb phil and/or ed. You can build commerce cities outside of you super-capital (why not?!). You can play however you want, it's your game.
These particular games I take as food-for-thought and, to be honest, I'm full!