I am aware of that. That was revealed by Michael Milken, the megamillionaire junk bond baron that was convicted of some white collar crime (some say unjustly) and sent to prison for 22 months.
After Milken got out, he was blindsided by Trudeau in the strip after he was hired for some sort of business course at UCLA. Milken -- a prostate cancer survivor who now focuses on his foundation for research a cure -- apparently hired an investigator and found out that Trudeau hasn't drawn his own strip in years -- he draws roughs that are faxed across the country to better artists.
Good catch. I think a new tack would be to loudly complain in Letters to the Editor everytime TruDUH is misidentified as "the cartoonist who draws Doonsbury."