I think you are probably right. Retro M&N Smyth (1996-97 home) and Laraque (1997-98 road) went up on the team store's site recently.
https://www.icedistrictauthentics.com/collections/mitchell-ness-blue-line-retro-jerseys
Under FAQ it says more retros will be released this spring and fall. A poster on reddit said the next batch includes jerseys for Cujo, Weight, and Hemsky.
I remember the Sabres wearing their red alternates for a playoff game against the Flyers in 2001.
Game 2 of the first round in Philadelphia. They wore their black uniforms for their other five road games that year.