What false symbolism?
Alien was rife with imagery both sexual and otherworldly. It's perfectly reasonable to say that it was multifaceted and had depth. 'Cause that's true.
Predator doesn't really match up on those grounds. It does have symbolism and depth, but not to the degree that Alien does. But it was never designed to be that way. Predator was meant to start as a schlocky 80s action flick and end up as a horror story. It did that and did it well, no doubt.
Alien, in the same way, was designed to hit you right in the nads of your subconscious. It did that and did that well, which entailed greater depth and symbolism. That doesn't make Predator bad, or even objectively worse. It does make it significantly different, though. Different enough that, upon reflection, paring the Alien and the Predator seems to be really f**king bizarre.