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How to update hostapd configuration after editing /etc/config/wireless?

Per this GitHub issue I want to disable ldpc on my WRT3200ACM running 19.07. I’ve updated /etc/config/wireless like so:

config wifi-device 'radio1'
[snip]
        option ldpc '0'

But I can’t tell if it has gone into effect. If I understand stuff correctly, this should update /tmp/run/hostapd-phyX.conf with a ht_capab / vht_capab line. However, no changes like that happened.

I’ve tried a handful of things, including uci commit and reload_config and just plain rebooting the router but no progress.