There must be a few examples of so called sports washing which has actually worked. I can't think of any though.
That means it may have worked on you in some prior instance.
The goal is to inure people to its effects. That's why calling it out (even to the point of irritating people - I know the whole affair is very irritating to me!) is important - people will be reminded to see it for what it is. The distracting hypotheticals and whataboutist deflections play directly into the hands of the entity engaging in it.
I guess to some, whether what SA is up to in golf constitutes sportswashing is up for debate (it seems very clear to me that that's what's going on). And I guess some others are in favor of SA laundering its reputation in this way.
Regardless, every "What about China!" and "What about Saudi involvement in other sports!" and "What about US commerce with the Kingdom!" helps SA derive some value from this project. Golfers like Phil Mickelson and DJ are getting paid handsomely to help with that while lots of others seem eager to do it for free.