I find it unlikely that these are inspired by Nixon. Nixon are not luxury watches nor are they suitably expensive given the GTAO pricetag. The slogan evokes Omega's 1931 "exact time for life".
Design wise they're less obvious - the Crowex Chronosphere is the Rolex Sea Dweller (the silver one looks like a Submariner too, but the Titan Black Sea Dweller Deepsea matches the look of the carbon watch) and unlikely to be anything else. The Pendulus watches are a bit TAG-Heuer honestly.