DJT tweet did say fastest animal on the planet.
But not technically fastest animal on the planet. Plus if you factor in the occult symbolism, birds of prey, the whole prey/pray, I think the falcon is more relevant to whatever this anon was bringing up.
The gazelle knows it's about to become dinner, it sees the cheetah (or senses it) and can attempt to run from it. The falcon kills its prey before it ever even knows what happened. The strike from the falcon seems more relevant, comes from out of no where, enemy has no idea it's coming until it's already over and he's a goner.