I guess you could argue that there are still avenues to wiggle around the new rules but at least the width of the corridor was reduced.
There are various firms that look at market transaction data to estimate outstanding short positions. However, they rely upon various assumptions since firms don't report how may shares they purchased to cover shorts. Hence, claims that GME is 130% oversubscribed or any other assessment could be wildly off from reality.
Also note retail investors are around 15% of GME. Most shares are held by institutional investors. What's going on isn't David vs Goliath, the situation is more diffuse.
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