Why do people argue that tahm has the most effective hp at lvl 1?

Not sure if this should go in another topic, this is mostly a rant about in game interactions and me wondering why anyone would say this in order to justify the 70 hp nerf.

A 3 second shield is not effective hp, especially if you don't have the means to force a fight to continue (your q slow)

By this logic, champions who can go untargetable like have the most effective hp in the game since he can avoid an infinite amount of damage....(less than half duration but can also be used as mobility and mobility is also a tool that can be used to avoid an infinite amount of damage.)

Yes tahm kench has the potential to continue to do damage while having his shield up, but fizz also has the potential to save himself from ungodly amounts of damage and both scenarios require the enemy to be cc`d or unbelievably bad.