When he writes columns in the Financial Times* and elsewhere, he uses normal paragraphs, which I assume he also does in his forthcoming book on Brexit, to be pubished by Oxford University Press in 2025. He chooses to write the way he does in his blog for the reasons he outlines in the post to which I linked, but he can certainly write in paragraphs when he feels like it.
*The FT, for whom he writes at the moment, is ferociously paywalled, but here's an older example from when he wrote for the New Statesman:
Why there may be a better alternative to a “statutory pardon” for the Enigma code breaker, who was prosecuted over his homosexuality in 1952.
www.newstatesman.com
Evernote link