I don't know how many different ways I can explain why this conclusion is false, but I suspect none of them would sink in.
Maybe the question to your "true or false?" comment to 'tptacek will elucidate adequately why the worst case of the WhatsApp vulnerability is still miles above what Telegram offers in terms of privacy, and even aside from Telegram, would be most generously a sev:medium (but by most measurements a sev:low).
In that case, you should consider WhatsApp's group security issue as severe.