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Motors feed chaff from rolls of about 40 pounds through cutters carried on some aircraft to produce either bursts or a continuous stream. The continuous stream technique, called saturation chaff, may be used by aircraft to cover a large area. By 2005 or 2006, the Army also planned to use saturation chaff to mask vehicle and troop movements. Using a cutter, 360 pounds of chaff from nine 40-pound rolls can be deployed in 10 minutes. Depending on the method and the number of aircraft, such releases could disperse billions of fibers. The B-52 can carry about 750 seven-ounce boxes of chaff; each box contains up to 11 million fibers that can be expelled continuously or in bursts.
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A saturation continuous stream chaff deployment would be exactly what a smaller plane would drop if it was trying to mask a much larger commercial plane.
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?