Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Tryndamere is one of the best 3v3 heroes in my books and using attack speed to hit more crits early game with an elixir works really well for me, getting first blood puts you in a really good position to destroy your lane espiecally the solo 1v1 top lane. I use ghost and exhaust just to have that extra kill potential early game and later on versus the carry on the other team, if your a good enough tryndamere you shouldn't need a flash or anything else to get away.
You can obviously go crit runes as well but this is the way I play him and it seems to work, take in mind early game you might not crit as much or for as much as another tryndamere but later on he will get chopped up.