Ive won all those matchups as tahm kench, even before him currently being strong.
Including shyvana when I went jungle tahm.
Tahm is actually a lot better against tank busters due to the fact that he doesn't rely on health / armor steroids that can be countered by max health damage and true damage or armor pen, he relies on a shield that can effectively give him 35%+ damage reduction when timed/used correctly, despite the enemy carrying true damage.
If you want to make a tahm kench player cry you pick
and dash away whenever he gets more than 1 stack on you, riven players completely control how long trades last against kench since they are effectively immune to his q slow and disrupt him from auto attacking/fighting back, making her perfect at hit and run.
And don't feel discourages to do short trades with him during laning phase because of his grey health, with one point in grey health he only heals back 15% of the damage he takes which is almost nothing.