No, a Buccaneer loss is extremely unlikely to help the Rams in the standings.
And a TB win HELPS the Rams tremendously with next year's Falcons draft pick.
Bucs are 7-6, Rams are 10-3, and Rams own the tiebreaker over the Bucs due to their head-to-head win. So the only possible way the Bucs could overtake the Rams in the playoff seeding would be if Bucs go 4-0 and Rams go 0-4. Just no way that's gonna happen.
So yeah, every Rams fan in the world should be rooting for a Bucs win and a Falcons loss tonight.