It's possible it could have been digitally changed. The gate weave might have happened when they transferred the '93 print to laserdisc.

For example, the GOUT has a lot of gate weave related to the equipment used in the transfer (the print they used was likely far more stable).

However, the rotoscoping process sounds newer, and all wikipedia says is:

In 1993, Snow White and the Seven Dwarfs became the first film to be entirely scanned to digital files, manipulated, and recorded back to film. The restoration project was carried out entirely at 4K resolution and 10-bit color depth using the Cineon system to digitally remove dirt and scratches and restore faded colors.

I think the most you have to worry about is color changes.