I also believe these are true words and a very accurate assessment of Putin and Biden. As a former oligarch, he is also correct in stating no Russian oligarch is a sincere oligarch so much as an agent of Putin.
When President Biden stated Vladimir Putin must leave the presidency of Russia, it was an ethical assessment, not one of regime change. That is very accurate assessment.
Where do presidents ever get the idea that a war is going to bring citizens to the streets with flowers? A war is a war. Anything else is self delusion.