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Lot of confusion of course, but its not all wrong. Adding fins
increases convection, changing the radiation/convenction ratio. And
yes, lower water volume rads will cool faster between boiler firings,
the 2 factors resulting in lower minimum radiated heat levels.

However add in the "they keep me warm for 20 minutes after the radiators
have gone cold" and you quickly wonder why he needs the rads at all and why
it should be any different whichever rads have gone cold.

To restore greater evenness of temp one can arrange for the boiler to
fire more frequently, by reducing the hysteresis of the stat. This can
be done by changing from a bimetal stat to an electronic one.

Just as well really as I use skirting heating and that only holds a bit of
water.
You don't want much water in a heating system, you want quick response and
close control.
A lot of water is slow to heat up and slow to cool down making temperature
swings almost inevitable.
Mine just sits there at about +-0.5C.