Something's up with Lorca, to be sure, but I doubt that Tyler/Voq is a double bluff. Even though the signs seemed obvious to many of us all along, there were also far too many people who didn't pick up on them at all for it to have realistically been intentional misdirection, methinks. But we'll see, won't we...
I find it far more likely that Lorca is an agent from the Mirror Universe than the idea that he's the Klingon spy sent back to Discovery to eventually deliver the spore hub drive into Klingon hands. I can sort of buy into the concept that our Lorca was either kidnapped and taken into the Mirror Universe or may even have been killed and that the guy we've been seeing since his first appearance is an Imperial Terran officer sent by his side to acquire more advanced Federation technology from our universe. Even if that isn't the case it's certainly a better explanation for a lot of his behavior than him being a Klingon sleeper agent who was programmed while aboard the prison ship.