The only information we have about gas giants under the clouds is theoretical. We can’t compare a real mountain we can observe with hypothetical mountains we cannot observe.
Olympus Mons is the tallest mountain in the solar system THAT WE KNOW OF. The “that we know of” or “so far” is kind of implied.
If we discover a bigger mountain it will be in all the clickbait news articles and you’ll find out at that time
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