Just for clarification, we're talking about guaranteed lottery kids.
If the NBAPA wanted to poison the well, they would need to do two things. First, tell any of these kids seeking advisement that they expect a season long lockout. That's not technically a lie and an argument could be made it's honest. What I wonder is if they then launch into a sales pitch about the importance of returning to school and honing their skills. THAT would be the NBAPA acting in its own interest at the expense of people it will theoretically be protecting in the near future.
And just to be clear, anyone who is a guaranteed lottery pick is a fool not to declare. But I'm guessing you've got a brilliant argument why not securing 6 to 12 million dollars is better than the risk you'll never get a penny of it.