Um, no - not unless your car is needing them to begin with.
2ner? Do you mean tuner like he knows what he is talking about? Did he actually look at your car?
Out of that list, I could only see CV joints as getting higher wear from AX than regular street use, but you've got to realize this is, what, 6 runs at 45secs/run versus the daily wear and tear you would normally have.
I'd only believe him if all these parts are high-mileage on your car and he was recommending you replace them. If they need to be done, they need to be done whether you autocross again or not.
Let me guess - he'll be charging you for this