Perhaps. In practice, I think it's probably a chicken/egg situation. A little hard to discover which came first.
If you read the John Jay Report on the sex abuse crisis, you'll see that 44% of the accused priests analysed in the report, were ordained prior to 1960. That's almost half. This before Vatican II and before the proverbial you-know-what supposedly hit the fan.
This tells me that there were significant numbers of homosexual clergy already in place prior to the 1960s. I have no doubt that many of these men played significant roles in the chaos which ensued in the wake of VII, which in turn, led to an even more liberal and pro-homosexual attitude in seminaries.
In other words, a "snowball" effect.