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The Wuhan wet market episode, in retrospect, was almost certainly a superspreading event rather than a patient zero situation. The virus's effects are so variable from person to person (lots of asymptomatic carriers, people who just get a little cold, symptoms undistinguishable from the flu) that it was almost certainly already circulating in Wuhan unnoticed, until it became big enough to be hard not to notice.

Consider for example what happened in the US, in Washington state at the beginning of the pandemic. The first local community transmissions were detected weeks after they had already started happening, even though there was already a relatively high degree of alertness. Without testing, it wouldn't have been detected at all until a similar superspreading event finally took place.

The very fact that miners got sick a few years ago makes it also sound likely, based on Wuhan's history and based on the virus's characteristics, that bat-to-human transmission took place in similar circumstances as the miners' a few weeks or months before the Wuhan wet market event, had some low-key human-to-human transmission simmering in the community which people wrote off as the flu (at worse), until that one superspreading event.