This is basically not a true statement. You can see for yourself here:
https://en.wikipedia.org/wiki/Post-election_lawsuits_related...
Here's one example. It clearly wasn't decided on procedural grounds.
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Judge Matthew W. Brann dismissed the case with prejudice on November 21, citing "strained legal arguments without merit and speculative accusations," noting that "[i]n the United States of America, this cannot justify the disenfranchisement of a single voter, let alone all the voters of its sixth most populated state ... [o]ur people, laws and institutions demand more". He likened the Trump team argument to "Frankenstein's Monster", and characterized the requested remedy to disqualify nearly seven million votes as "unhinged from the underlying right being asserted."