Yes, TDP is an inexactly defined and meaningless term and while to the layman it would generally be understood to have some relation to the heat emitted by the CPU during normal operation, it's possible that both chips in fact only generate 1W of heat and were given a 140W TDP because Intel had a pre-existing cooling solution and a warehouse full of spare parts. Yes, you are correct on the semantics. Power consumption has no relation to TDP because heat generated has no defined relation to TDP.
However, given any meaningfully bounded definition of TDP, the case is still made that the TDP of these chips should be dissimilar. The later numbers show that under full load the power draw at the wall increases by 20W/core used. Unless your "typical load" used for determining TDP does not actually make use of the full number of cores (which I would think could be fine for a desktop processor, certainly not a server) then it's clear that the heat generated by these two processors should be dissimilar under any load.
If the 4 core actually needs to dissipate 140W under a typical use case, then the 6 core should absolutely need to dissipate more unless the "typical use case" is uselessly applied.
If we want to talk cars... Let's say I sell a base model with a top speed of 80mph, and a sport model with a top speed of 120mph. But I tell you you only need to put 80mph rated tires on the sport model because that's as fast as a typical person drives. Would you really claim that the sport model's tires are correctly rated? Would you not be surprised when you drove 100mph in the sport model and the tires exploded? Why on Earth would anyone even buy the sport model if it's crippled to nearly the same performance as the base model?