No this has nothing to do with our actual listing on the TSXV. This is just an index of select companies based on market cap.
Companies are automatically added/removed to various indices all the time, based on criteria used by the underlying index to determine inclusion eligibility.
I would expect Poet to be added back once the market cap recovers.
https://www.tsx.com/listings/tsx-and-tsxv-issuer-resources/tsx-venture-exchange-issuer-resources/sandp-tsx-venture-index-eligibility