What difference does it make? I don´t care if there are spores or not. I don´t care what kind of spore do they have. Is it relevant info? With all my respect, I think not. If you understand how the imbalances works this info becomes useless.Spores are not always there. This is a wide-spread misconception. I recall the words of one unhappy aquarist many years ago who despaired of "hellish spores floating in the air". It is not true! I have never had black beard algae over the last 40 years of growing aquarium plants because I have given the bleach treatment to plants before I introduce them into my tanks. I have had every kind of growing condition---high light, low light, high nutrients, low nutrients, high plant load, low plant load. I am sure I have frequently had ideal conditions for growing black beard, but it has never showed up. The bad hair algae, fuzz algae, red algae, Cladophora, Rhizoclonium, Oedogonium, staghorn, etc. always get in tanks in the vegetative state. They do not produce resistant spores. I have seen illustrations of their life cycles in botany books. All except the Rhodophyta (red algae, including black beard) produce flagellated, swimming zoospores that are short-lived and not resistant. The Rhodophyta produce non-flagellated spores that also are short-lived and not resistant and these depend on water currents to disperse them.
Theory must have consequences, otherwise it becomes a dogma or a chant.
I know that certain algae blooms under certain conditions, I call them imbalances. You correct an imbalance and they stop bloom. You control the imbalances and they never bloom (controlled imbalances Method).
But I am not a priest and the MCI is not the bible. If to disinfect with bleach works for you , good for you but this debate is about the MCI.