Once an SEC Registered stock de-registers the only reasons the SEC would thereafter suspend a stock is either for fraud or the stock is a shell (zombie) that is susceptible to hijacking to commit fraud.
Otherwise the SEC doesn't give a rat's puhtootie about alternative reporting OTC stocks. As far as the SEC is concerned they place an extreme buyer beware bias against all OTC stocks that are not registered with the SEC, particularly de-registered stocks.
Once a stock is not (no longer) registered with the SEC and no frauds or zombie status exists only FINRA has the clout to delete a ticker symbol for trading inactivity.
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