>>1583383not him but look:
a: tange prestige concept exotic thin tubing
b: touring bike from japan so iunno do they salt their roads in winter? sea spray? certainly would have been rained on a lot
i've seen this a few times as well.
I agree steel frame rust is largely a non-issue and frame saver is unnecessary but it's not outright a bad idea especially on very nice frames in poorer condition rust wise.