Continuous stream chaff is not a new development. Its at least 50 years old. It is also no longer being used by anyone that I know of, and certainly not in the giant cloud tactic you are describing.
Chaff in general has fallen out of favor, due to much more capable engagement systems that can easily distinguish Doppler and/or use leading edge targeting. Active electronic jamming and spoofing are where things are today.
Further, which aircraft are you suggesting would have been employing continuous chaff stream capability? The Su-25? Where would they put that on the aircraft, and to what end? What would they have been trying to hide with it?
There was a SU25 shown near the commercial jet by Russian radar. And we have reports from aviation experts, not verified, that the Ukrainians were running CAP missions ever since they lost a fighter to the Russians.
We do not know exactly what happened yet, since the Ukraine will not release air traffic controller records or any of their air traffic radar records yet. Other then that, read post #15.
Psst. Don’t tell him what an F-22 can do it will blow his mind.