Completely incorrect. "The Court usually is not under any obligation to hear these [appealed] cases, and it usually only does so if the case could have national significance, might harmonize conflicting decisions in the federal Circuit courts, and/or could have precedential value. In fact, the Court accepts 100-150 of the more than 7,000 cases that it is asked to review each year." Source: https://www.uscourts.gov/about-federal-courts/educational-re...
The SC not hearing the case doesn't mean they uphold the lower court's ruling, it means they aren't hearing the case.