The most important aspect of HEA you can gain from an honest dealer/salesman is component synergy. Will they suggest a better synergistic brand they don't carry? Probably not. This is when the buyer has to put some time and effort in, the dealer is not there to be your personal audio "Guru". Getting to the OP's question, NO because there are too many variables, you only know the posters "screen name" not the person.
Should Audiogon forum dealers be held to a different standard?
Usually, people take a measured approach in trusting salespersons because of conflict of interest - commission vs serving customer’s interests. It’s great when you find one you can trust on your behalf.
However, I noticed that sometimes when an audio dealer posts, they’re met with seemingly automatic skepticism beyond the usual - like they are automatically dishonest about helping audiophiles, they just want the sale. I do like them informing us they’re dealers in their posts which allow us to scrutinize their claims more closely.
Should Audiogon forum dealers be held to a different standard than other members?
FWIW, when I first got interested in high-end audio, I had a very bad experience at an audio store trying to push a sale of an inferior sounding system. So for years I avoided dealer opinions for lack of trust and did all my own research. Luckily, lately I found a knowledgeable audio dealer with whom I can trust - his knowledge was invaluable in my purchasing decisions.