Here’s the problem with your attempting to apply Motte and Bailey to that:
If challenged on those other things, we do not reply that ‘rationalism is just science/reason helps people be right, how could you possibly oppose it?’ Well, except for the last, which really seems like that actually addresses the problem.
So, it’s just a perfectly ordinary (and acceptable) sequence of progressively more controversial claims, and not a Motte-and-Bailey system.
Different members act as different parts of the motte and bailey: some argue for extreme things; others say those extreme things are not “real” Rationalism
Here’s the problem with your attempting to apply Motte and Bailey to that:
If challenged on those other things, we do not reply that ‘rationalism is just science/reason helps people be right, how could you possibly oppose it?’ Well, except for the last, which really seems like that actually addresses the problem.
So, it’s just a perfectly ordinary (and acceptable) sequence of progressively more controversial claims, and not a Motte-and-Bailey system.
Different members act as different parts of the motte and bailey: some argue for extreme things; others say those extreme things are not “real” Rationalism
That structure makes it not motte and bailey—the motte must be friendly to the bailey, not hostile to it!