There is nothing in the realm of science saying you need 6 meals a day to build muscle. All that matters is calorie and nutrient intake, but mostly training volume.
Whoever is implying 6 meals a day are needed to grow is just spreading misinformation. Don't believe anything you see on TV, blogs and forums and if you have to, then ask for sources or search for them yourself. Also with books, only read scientific books not older than 3 years.
Random articles by strangers are not reliable sources, and if you find a study that seems stupid most probably it was done and or sponsored by someone who's trying to sell you something so always check the authors.
There are industries who sponsor and or manipulate scientific researches to convince the ignorant part of population that can't understand science that their products are awesome. Butter, eggs and protein powder industries always do that. The world is filled with frauds.
Just a famous example is Jeff Nippard, a guy on YouTube who will sell anything, calls himself an expert on nutrition, health and fitness while having no authority. He sells protein powders and references studies sponsored by protein powder industries to "prove" that isolated protein is not toxic or studies sponsored by milk industries to "prove" that whey is not unhealthy.
So again, don't listen to frauds, ignore salesman and stay away from them. The guys who are saying "eat 6 meals a day or lose your muscles" are usually just frauds who sell nutrition and training programs. And it's always like that; if they have an economic interest they will lie to the public any time.
Especially bodybuilding.com is filled with those types of frauds, not a good place to get information. 9 Articles out of 10 are written by steroid users and salesman, people who sold their souls for the money.
If you want to gain muscles just increase your calorie intake every 1 or 2 weeks and increase training volume as much as possible any time you can. The fastest way to reach any goal in life is to put in more effort daily, anything else is a waste of precious life time.