Gynecomastia is a hormonal condition, so yep substances with high estrogen can contribute
But this is the problem with the bloody media & their crappy information... I doubt' you'll find a single guy on here with actual gyno (male breast tissue NOT chest fat). The overwhelming vast majority of men with flabby chests are simply overweight & need to lose fat through.. "drum roll".... dieting (or/and activity... basically energy expenditure) which is what the article is telling them NOT to do.
Now just imagine how many overweight men will read this article today telling them not to diet.
To top it off they claim that performing bench press increases testosterone... now while everyone here knows I LOVE the big lifts (bench/squat/deads) this isn't how endocrinology works.