That reason doesn't satisfy, it's not taking into account the connection to encryption. We can't know if this is simply an attempt to shutdown Telegram from use in the country, or whether they would have found the next most believable excuse to block them if Telegram gave into the encryption issue.
Not intended to assault but those are two rather bold statements, I mean that WhatsApp does not and Telegram does have anti Putin interests, anything substantial and verifiable behind those claims that you can share with us?