I think it's unlikely that Robinhood (or any brokerage) would compensate people for losses on hypothetical trades that could have been made during an outage. Such a policy would allow customers to pick their entry and exit points, and extract money from the brokerage at will.
Even if the trades were well-defined at the time the outage occurred, there would still be an asymmetry between people demanding compensation on their profitable trades while eschewing losses on their bad trades. It's doubtful any brokerage would be willing to eat that.
Execution risk is a risk.