As far back as 2014, when he was _First Deputy Minister of Foreign Affairs_ he was criticizing Havel and his policies from a policy standpoint: https://www.praguepost.com/czech-news/czech-foreign-policy-a...
He pitches the issues between Havel and Kundera as ideological, and representative:
Their exchange reflected the fault line between democratic-socialist and liberal intellectuals: Kundera argued for a new model of society that would be free and fair, avoiding the vices of both Western capitalism and Eastern European authoritarianism; Havel defended Western capitalism as the only desirable model, needing fine tuning, but no major revision.
And his position on the ideological battle is quite clear in the book he published titled Budoucnost Levice bez Liberalismu_ (The future of the left without liberalism).
This isn't to say the article isn't accurate or interesting. (I loved both Kundera's The Unbearable Lightness of Being; and Havel's Summer Meditations). But I think it's useful context, and I'm definitely taking its contents with a pinch of salt, and double checking the falsifiable claims therein.