Huh. Multiple European TLDs (dk cz se nl sk no ch) with >50% DNSsec signatures on domains. https://stats.dnssec-tools.org/#/?top=tlds&tld_tab=3

Honestly, I would've expected everything in that table to be an order of magnitude worse for DNSsec. Good to know!

(It's linked from the article you linked, transitively thanks for that link!)