So to set out your case a little more clearly.
The original video you posted was from a guy called Aussie Cossack. (Russian resident in Australia who is a major Putin apologist who has gone on record to say that Alexander Navalny should be liquidated).
He stated that Australian Police used a Long-Range Acoustic Device (LRAD) to discomfort and disperse a crowd protesting outside the Australian Parliament. The video stated that as a result the protesters suffered nausea, vertigo and severe headaches as a consequence of the device being used in "alert" mode. There is no video of it being used to emit sirens.
The Police avoided this by putting in earplugs.
The Canberra Police stated that the device was used in its loudhailer mode only, which you dismissed as state and media propaganda.
However, it now appears the same device, shown in a set of different videos and reports from a different group of protesters is not an LRAD at all, more likely an active denial system.
In its latest guise this does not emit huge decibels of noise but microwave radiation which, according to one video, cooks people from the inside. For some bizarre reason many of the victims instead of having their insides frazzled have developed a very similar symptom to the non application of sunblock on the outsides of their bodies on a very sunny summer's day in Canberra.
Miraculously, none of the police holding back those same crowds seems to have suffered any of these symptoms when the "weapon" was deployed in this guise. Presumably because earplugs also protect them against the side effects.
https://theconversation.com/whats-an...ication-177442
Still it takes a special talent to join the dots of two different conspiracies by two groups competing for hard earned YouTube dollars and conflate them into one massive contradictory fantasy.