Your point was that in one picosecond we hardly moved a muscle?
I wouldn't expect that we would. Are you jogging when you read your comics?
If you meant to write that Wonder Woman hardly moved a muscle in one picosecond, you need to tell me why she should have thought she needed to.
Do you expect to get stabbed by your friends the moment you turn your head when you have a conversation with them? Even if you're helping them control a crowd? At best you can make the case that Wondy should have been prepared for literally anything and wasn't.
You're definitely making a claim about what Wally did. You're doing that by simply stating what he did in that one picosecond. It just happens to be a verifiable claim and one backed by evidence, instead of the unsubstantiated variety.
I said little if anything regarding Deathstroke's actions as Plot Induced Stupidity (PIS) because I am not 100% sure they are. It's a common theme in comics that moving at different speeds gives a character different perception rates. For example, Gladiator as he normally is fights at roughly the rate Thor does when fighting Hulk. However, I distinctly remember a story when Thor and the Fantastic Four were sped up to the point that they were an almost imperceptible blur. Gladiator sped up to match their rate and suddenly they were no longer a blur but beings he could have more or less normal interaction with. Wally presumably has several such modes now. Can he make a miscalculation in any of them? Better question: Slade slamming Flash into a wall seems to be something from many years ago. Did Flash regularly demonstrate great enough control of his speed back THEN that an enemy catching him off guard as he rounds a corner would have been considered absurd?
Deathstroke drawing blood on Wonder Woman more than 20 years ago wasn't the absurdity some might have considered it in 2007. The great damage soak and healing and durability associated with her during the Sacrifice era came as a result of rather random, chaotic boosts. It's arguable that the upgrades in her toughness were the PIS, not her vulnerability.
For that matter, Wonder Woman since the 1940s has been a literal deus ex machina character, with her ability to take punishment as variable as the whims of her rotating roster of writers. The same Wonder Woman who literally lassoed the Moon and resisted tank shells bouncing off her body, is the same one who could be knocked unconscious with a blow from the butt of a rifle. It's as if Greek deities were constantly deciding what should physically happen to her in any adventure, and, of course, there is some truth to that.