no, rockets would have had bird rights on parsons next year as well if he were UFA.
It was a calculated gamble, which implies there's a chance it doesn't work out in your favor, but claculated gamble is not equivalent to stupid decision. Here's how Morey probably saw it:
Premise/End goal: I like Parsons, and want to keep him around long-term. He has significantly outplayed his rookie deal, and is going to get paid in free agency either by us or another team. There are two paths:
Path A: RFA this year. Costs $1.9M in reduced cap space. 50% chance he gets a max deal, 50% chance he gets a value rate (closer to $8-10M annually), but either way, I can see the price, and choose to match, or let him walk
Path B: UFA next year. 0% chance he gets a value rate, 100% chance I have to offer near max/max contract, because I can't sit back and let the market price him, because I have no contractual right to counter at that point, I'm at the complete mercy of parsons and his agent, so I have to make an aggressive initial offer right out of the gate.
Morey chose path A, probably because he decided that $1.9M in reduced cap space was worth the 50% chance of getting Parsons locked in at a reasonable figure, versus having 0% chance of locking him in at a reasonable rate next year. Of course it implies there's a 50% chance of him getting a max offer this year in RFA, but that's the nature of a calculated risk. You weigh all the factors and make a decision.