This is a meme that fails to understand the actual, in practice limitations of BMI. The problem is that it underdiagnoses obesity, not that it overdiagnoses it. The problem isn't the nonexistent horde of lean muscular people with BMI > 25, it's all the clinically obese people with BMI < 30 thinking that yeah they're overweight but it's not that bad, they're not obese.
It's really easy for a healthy man to get BMI >25 with a few months of weight lifting. Frankly, denial and downplaying of this fact just increases skepticism of BMI and the people who say it's a relevant metric.
