It is 1.33x. It is most likely just a minor bug in the damage calculator, but the game boosts it by 1.33x. In the case of Flare Blitz, plug it into the damage formula and you get this:
252 Atk Tough Claws Zard-X vs. 0 Def Azumarill: ((2*100+10)/250)*(359/196)*120+2)*1.5*0.5*1.33=186.162=186
252 Atk Life Orb Zard-X vs. 0 Def Azumarill: ((2*100+10)/250)*(359/196)*120+2)*1.5*0.5*1.3=181.962857143=181
Idk if you apply Tough Claws directly to the BP, but if you do the output is 185 so it's minor at best.
Yeah, you'd apply Tough Claws directly to the BP instead of at the end like Life Orb which is why my submitted outputs were slightly different, but the range was the same. So yeah, it does 185 damage max if it's truly a 33% boost. I guess I should submit this as a bug in showdown's calculator?