It took a while but I received a reply and I must say it's positive:

Thank you for raising this and for taking the time to identify the specific issues.
You make a fair point that key information about BSV, including its maximum supply of 21 million coins, should be clearly presented and supported by authoritative sources. We will review how this is currently communicated across the relevant BSV Association channels and determine what supporting information CoinMarketCap requires before submitting an official update request.
We will also review the other points you highlighted, including:
The incorrect Gate trading-pair link
The limited wallet information
The social and community channels displayed
The relevance of the articles appearing within the BSV news section
Some of these areas—particularly exchange links, eligible social channels and news aggregation—are ultimately controlled by CoinMarketCap or the respective third-party platforms. Nevertheless, we can raise any inaccuracies directly and provide them with verified and up-to-date information from the Association.
We agree that CoinMarketCap and CoinGecko are important reference points for users researching BSV, so ensuring that the information presented is accurate and appropriately maintained is worthwhile. We will take this forward internally as part of our wider review of BSV’s representation across these platforms.
Thank you again for bringing it to our attention.
Kind regards,