Having been in both a dealer and an independent, I can say without question that this is an incredibly ignorant statement. Dealer techs have better training, shop tools, reference material, and that's it. However many don't know what do with it.
Most of the good dealer techs eventually leave for independent shops.
I agree with this. My dad worked at dealers for years back in the 80's and early 90's. The school he teaches automotive tech at now came to the last dealer he worked at and offered him the position. He has his own shop as well and doesn't charge nearly what the dealer would charge. I just had a coworker bring her car to him after the dealer wanted over 1K to change the lower intake gasket on her Altima. My dad said he charged her half of that. I know he does just as good or a better job than the dealer would have, hell he places some of his students at dealers around here lol.