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@Dammit
I suspect where he’s going with this is that if the heater was turned off when you blead the system then the valve that admits the water from the engine block to the heater matrix would have been shut. Starting to hand wave at this point- therefore there may be air pockets in the lines leading to/from the heater matrix which the water now can’t pass through? IDK, maybe the water in the heater matrix was stolen by the underpants gnomes and it’s now full of air. Something to do with ensuring the whole system is full of only the coolant and that air/air pockets are banished.