Why cant you use picture proof for IL speedruns? I used picture proof for level 1 and it got rejected.

Easy to manipulate with programs like Photoshop.

Simply because video proof is required for this game no matter how short the levels are, as mentioned above pictures are easier to manipulate then video's, matter of fact that taking a screenshot of the WR video and then submit it is easly done. recording your video proof is not hard by using OBS (free software)! where you simply add the source (the emulator or the capture card for your console) and press start recording