Wrong. Losing for legitimate reasons and losing for the mere sake of making someone seem strong is literally the defining difference between jobbing and just losing a fight.
According to you there is no difference, because any time a fight is lost the winner looks stronger and therefore the loser got jobbed. Thats not what jobbing is.
You said it yourself, its about propping up the opponent. If the sole purpose of Vegeta's ass whooping was to prop him up, we would only know from plot reasons. Vegeta can only have gotten jobbed if:
1) If there was no good reason for Vegeta to ever stand a chance against Hit in the first place. It was always going to be a merciless beating just to show how strong Hit is. Untrue. Vegeta could have stood a chance, he's stronger than Hit, presumably.
2) If the ONLY reason Vegeta lost was retarded, therefore the whole thing was set up to prop up Hit. Untrue. Vegeta lost because he couldn't counter his technique, which isn't that unreasonable, considering the freaking God of Destruction of the universe had never seen it. You can't just call that getting jobbed.
Everything else is not jobbing. Also you can't just decide Vegeta lost to prop up Hit without evidence. Plotwise, it makes sense that he lost, and it was a fair fight against a fair opponent.
Its not jobbing.