The Brewers had a higher wRC+ on the road than at home this year, so I don't see any macro trends that would point to them having a home field centric cheating scheme.
That said, in Boyd's inning in Game 1 in particular there were a couple pitches where something was not right. Maybe he was tipping, and I definitely would believe that the Brewers are on the leading edge of trying to get and relay tells like that. But in particular there was a 2-2 changeup that missed a little low, and the hitter ignored it out of his hand like he was doing a 3-0 auto-take. So I'm at least a little bit raising an eyebrow, and part of me expect the Brewers offense to go to sleep the next 2 games.