>however, in older men, that increase can be avoided by protein ingestion.

Why on earth would you want to avoid it? That's like saying weight loss could be avoided by eating lots of cake.

It's an interesting question, I'm not sure. This is mentioned under the Health Risks section though:

"In people who have undergone testosterone deprivation therapy, testosterone increases beyond the castrate level have been shown to increase the rate of spread of an existing prostate cancer."

So there's probably myriad scenarios where one needs to balance testosterone levels with maintaining physical activity/strength training.