Color doesn't change for me, and it can't change because there is no colorspace conversion here.
Look at screenshots [001.mp4, frame 20]:
Original:
After inpainting:
Your problem I guess is in the encoding settings. Share MediaInfo of your encoded file.
For less blur try:
Code:
InpaintDelogo( mask="X:\002.png", Loc="0,0,0,0", Inflate=0, oPPm=1, oPP=3)