Oi mate, have you even read what we said? I had barbs with my senegal bichir. Bichirs are hella slow, but guess what? I found the barbs dying off one by one with my bichirs bite barks all over them. Considering oscars are a crap ton faster than bichirs, I'd say hell no to tiger barbs.
Ive tried this exact combo in years past. Once the oscar reaches 8" all bets are off.
Ime, the biggest problem with tankmates that are "too fast" as ive heard it put is that the oscar or whatever other predatory fish will still chase it, often injuring or killing itself, or damaging aquarium equipment or even the tank itself. If youre giving feeders in a 75 gallon tank with a full grown oscar, its a matter of when, not if this will happen.
My Oscar lived peacefully with my Roseline sharks, for about seven months.
Then one fine day out of the blue with no warning, she ate one.
So like others have said, if it fits at some point in time the Oscar will try and eat it.
I switched to Silver Dollars and guess what, she tried to eat one of them as well. Only thing that saved it was it was too tall for her to swallow it...
Both of these fish can cover the distance end to end of a six foot tank with a single powered flap of thier tails. Yet the Oscar still managed to eat one and almost eat the other.
If you are dead set on it, try it but don't say we didn't warn you when you wake up one morning with missing Tiger Barbs and a giant grin on your O's face and a giant bulging belly.