Well, that's really no different than what you can see in the average commercial gym here.
In fact, you can visit some 50+ gyms here never seeing anyone bench more than 220, squat or deadlift at all... Unless they're tall and overweight (and bench like 270 for their troubles)... Before you run into one serious gym where the majority put up 300+ benches squats and 400+ deadlifts.
Well. Likely a lot less rare than in Europe and a damn sight less rare than in Africa, but still.
Food choices have little to do with it though, beyond getting adequate amounts of protein in. You can eat "squeaky clean" and weigh everything you eat all the time for 10 years straight, train in a way that is touted by many gurus as great, be perfectly consistent in showing up at the gym... And make little to no progress.
Unfortunately, from what info you have given I still don't know how they actually train (periodization for example), whether they've gained bodyweight in that time-frame and how much, etc.
Happy new year to you too.
What's the average gym like where you live?