It's in this Wotton catalog, for example.
https://coursebulletin.montgomeryschoolsmd.org/SchoolCourseCatalogs/School/04234/MA
(That doesn't prove the class is actually still offered.)
I get the theory of the idea of Bridge, but it seems nitpicky to have both that and 2-Year, and it splits the student body awkwardly, making it harder to fill classes.
Comparing "1 year review of algebra 1 and then regular speed algebra 2" vs "go slower and practice more in each module", 2-Yr Algebra 2 seems more sensible.
If 2-Year Alg 2 is allowed after Bridge, for students who want to really slow down but not get off the track completely, that would make sense.
"MCPS forgot to remove Bridge from the website" seems plausible also.