The video referenced by the various social media is the second better resolution crash video. It shows long streamer like objects falling into the wreck site. By my estimate they are of the order of hundreds of metres long and to be visible at all at that range metres wide.
Here is a typical expose
https://www.youtube.com/watch?v=PUltrf8n_vA
It's complete rubbish of course but is still getting a lot of people exercised.
There is logistical impossibility of fitting a dispenser on a fighter aircraft capable of even dispensing those objects. That plus that size/type of chaff has never been seen before, and there is no known chaff dispenser in the Ukraine/Russian arsenal that could possibly deploy them.
The nearest I can find is a US dispenser that takes a reel of chaff material and cuts it to size in flight to match whatever radar frequency is being jammed. The reel is perhaps 4 inches wide.