All mRNA is regularly degraded. Just because it gets translated doesn't mean it is immune to the degradation machinery. In any event, none of this even matters

All mRNA is regularly degraded. Just because it gets translated doesn't mean it is immune to the degradation machinery. In any event, none of this even matters - the mRNA and spike proteins are completely innocuous on their own and this language existed just to assuage unfounded (but reasonable) fear.