He's got what, 4 more majors left in him? 6 at the most?
He above everyone else knows the deal after a long layoff. It doesn't take long for him to get his swing in shape. Getting his short game and feel back with the putter are his biggest objectives. But he's obviously limited with how much he can practice and go at it like it used to. The time off isn't a big deal. He's used to this.
What is hurting him is that he's been forced to miss majors, given his limited window, while time carries on. The dates have been established by ANGC, but it's not a guarantee that it'll happen. It probably will, but he's dealing with an even more condensed time crunch given that he's historically prepared for the majors with playing certain tournaments leading up to them. He doesn't have that luxury this year.
Of course, every other player has that same preparation crunch, but most of the usual 'favorites' are relatively healthy and younger. They can jump back in full steam ahead. Tiger? Not so much.