I'm definitely not having that mixing almost all of the world's best and most experienced cricketers into squads that are predominantly Indian and filled with youngsters and having them play in front of massive crowds is bad for Indian cricket. It's all wrapped up in the curious idea that in the case of the IPL (and ONLY in the case of the IPL), playing more cricket is bad for cricketers. It makes them tired, they might get injured, they might get 'burnout'. Getting good at T20 will, by some highly conjectural mechanism, make them bad at test cricket.
All of those things are true of domestic cricket too, which no one ever complains about, understanding that playing lots of competitive cricket with top-class players probably isn't the worst idea if you want to get better at cricket. Because to think that would be really stupid, wouldn't it. The principle of playing more cricket being bad for cricketers is only applicable to the IPL, because the IPL is cursed. Playing there causes burnout, injuries, incorrect priorities, unprofessionalism, tiredness, chronic impatience, general direness and acne, as it is unwholesome cricket.
No. It's all just old people spouting bollocks in an effort to discredit something they don't like.