There may be cause for that.
Texas, as the entire US, is ruled by 'employment at-will'. Hiring and firing is the norm. I do admit though, if the applicant did put a down payment on an apartment and other incidentals, this may be worth exploring.
However, even if there are grounds, would the newly hired want to continue to be employed there? The environment would be tilted against that worker and some companies would probably be looking for any technicality to let that person go.
Also, anyone notice how Glassdoor has changed its format from true averages to some sort of other format? It's a shame as it's clearly skewed (in this instance) to a much higher "average". Also, how can this company have 100% 'favoring of the CEO'? Lastly, this recent change isn't documented clearly anywhere on the website. This reminds me of what happened with the Better Business Bureau. It lost a ton of credibility when it introduced a pay to play type scheme.