True but , worse case scenario, they will live to fight another day. In any event the historical sample was against much slower bombers than B-29, so there may not be that much difference.
The MiG 15 made B-29s switch to night bombing over North Korea, with two caveats:
A: MiG 15 flew 140 mph faster, and 13,000 ft higher ceiling than the 262
B: North Korea had more cities destroyed than Germany or Japan by conflicts end in 1954
Also the USN and USAF used a development of the R4M, the 2.75" FFAR, the 'Mighty Mouse' that proved to be stunningly inaccurate, despite being fired in far larger numbers than what the 262 carried, and the 262 didn't have a radar altimeter or an early computerized ballistic predicting gunsight.
What the 262 needed wasn't the R4M, but a 20mm Gatling and predicting gunsight with a HUD