I was following this very closely at the time. This was part of a detailed and coordinated smear campaign.
The actual charges were pretty insignificant, even if true. But I don't think they were trying to say he was avoiding duty. IMHO, this was a leg in a chain of accusations that was supposed to establish that he had to get out early to avoid the physical.
There were going to be further "revelations" to come that would charge that the President was/is a cocaine addict. Something that was calculated to hurt him with his base.
I think the next story they were going to fabricate was the reason why W wanted to avoid the physical -- to avoid detection of cocaine use.