I wouldn't be so eager to jump into the happy-clappy credulity camp without understanding the functional basis for this.

1. Odds that he was intentionally faking, looking for an attention opportunity.

2. Odds that he believed he was crippled, when he was slowly recovering and the experience incidentally allowed him to "relearn" motor control.

3. Odds that SARS-CoV-2 caused a temporary change in neuromotor control incidentally to damage/remodeling elsewhere.

4. Odds that SARS-CoV-2 caused a permanent change in neuromotor control incidentally to damage/remodeling elsewhere.