The lifts in Bariloche go to about 2000m asl, which isn't very high, it's comparable to any central European ski slope. And it's very organized, friendly, and easy to manage. For an intermediate skier, I wouldn't think twice.
There are other ski resorts in the Andes, but they're more difficult to get to.
Valle Nevado in Chile is quite a bit higher, at 3000m asl. Also, the road up there is horrible, hairpin bend after bend. There's a hotel up there, but you would need to acclimatize, I think, before doing anything strenuous.
I have no idea about TdF, but being farther south, it will be colder and darker, and the days will be shorter. I do like skiing in the sunshine, so TdF is out for me.
Generally speaking, unless climate change intervenes (there are hints of a "super El Niño" for later this year), you should have snow from August to October in the Andes resorts. None of this is cheap anymore, though.