I'll be honest -- "defoliation" is big on cannabis boards with hydro growers who know nothing about actual plant biology. I'm definitely no expert, but from what I know the leaves produce energy from the sun and this is moved through the stem to help produce seed. Fruit is just an exciting bonus we get. Leaves are also a 'storeroom' for some nutrients that can be translocated if needed.
I have seen this recommendation before, however it was more of a way to encourage existing fruit to ripen before a hard freeze occurs in the fall. Like if the weather guy says in September "it's gonna be 20 next week" some people will go defoliate their plants to get the fruit to 'ripen faster'.
I've also seen the recommendation to keep tomatoes to 2-3 main growing stems by pinching/pruning throughout the season. That's 2-3 apical meristems, not actual leaves though. I've tried to do this, but much into the season I lost interest and stopped doing it diligently.
Kinda along the same lines as this is to limit N for tomatoes. High N fert/compost/amendments will encourage lots of vegetative growth. My old boss always put lots of straight turkey manure on his plants and said he only would get a few tomatoes from each plant. I kinda tried to tell him it was the high N, but then he got fired so I'm not sure if it helped him.
I would definitely not encourage you to try this on 100% of your crop this year. Maybe a few test subjects. TBH I get good
enough tomatoes just letting the plant do it's thing.