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The OP you are replying to here is obviously talking about shorting MORE than 100% of the float, which indeed should not be possible.

You need to stop getting your information from wsb conspiracy theorists. Here's an example of perfectly possible 200% float short:

Acme Corp has exactly 1 share of float, owned by Alice.

Bob borrows the share from Alice and sells to Charlie.

Diana borrows the share from Charlie and sells it to Eve.

Bob and Diana are each short 1 share for a total of 2. Total short position is 200% of float.

The better indicator of sketchy activity is FTDs, which may indicate that people are selling short without a locate.

Shorting more than 100% is absolutely possible and the reason it is possible and normal is explained in the SEC report.