They're for sure relaying signs from second, and unfortunately it's just part of the game. Brewers are doing it, Cubs should be doing it, Yankees have been blatantly doing it for a few weeks now and they were accusing the Blue Jays of doing the same -
It's the worst when you have a splitter pitcher on the mound. Absolutely have to hide your grip. Hopefully Boyd has fixed his tipping issues, because I agree with TT on feeling like the Brewers were laying off tough change ups that normally induce a swing and weren't fooled at all on some of his breaking balls.