If you think"odds" means the payout offered, then:
I'm going to go out on a limb with your numbers and say getting 12 to 1 is better than getting just over 8-1 odds on anything. Therefore, something paying 8 to 1 is not as good as something paying 12 to 1 odds.
Therefore, +820 could be considered a set of "worse" odds than 12 to 1. If the payout moves from 8 to 1 towards 12 to 1, we can say the odds got better. If the payout moves from 12 to 1 to 8 to 1, we can safely say the odds got worse.
I tried to explain it a couple of different ways.
Now,
if you consider the "odds" to be the probability of the event occurring then:
If you are trying to say the odds of them winning get worse as the payouts rise, you may be putting too much trust in the efficiency of the markets, or you may be right. Unless you can calculate real odd less the juice yourself, you are guessing.
Most of the time, with a house like Pinny, the payout offered is inversely tied to the probability, although rarely, if ever, are they the same number, due to vigorish.
In other words, if the probability of success decreases, the odds of payout increase.
So, for the sake of communication, make sure everyone is on the same page when they discuss "odds." If not, things can get a bit odd.
The same thing occurs with corruption in meaning when the term "juice" is used to refer to laying odds, instead of the vigorish. Bettors say such ridiculous things like "there's no juice if you win" and "only losers pay the juice."
If the absurdity of the last two quotes isn't obvious to the reader, then the sports bettor reading this may be in trouble over the long haul. Many of the most proficient handicappers end up losing money or profit due to faulty money management...and not understanding the vigorish involved can be a big, invisible, part of those losses.