Plausible, though I don’t know that’d be guaranteed.
IF off-world nephilium came and interbred or invitro’d or whatever such . . . AFTER the flood . . . seems to me their offspring would be as ‘robust’ as those before the flood.
However, we are all talking through our hats . . . not being there and all . . . LOL.
Otherwise they (the post Flood giants) would not have been so easily dispatched by Israelites.