So as you can see both files seem to be the same in 2k18 & 2k20.
(His from 2k18)

(Mine from 2k20)

The only difference is the file name style, but it's essentially the same.

I have even thrown it in the waigua directly just like he did in his original post.

I thought maybe my TXTR files were wrong, so I looked at his example. Before I saw his I only had the Min/Max/Mask/Binary.

For the Blimp Body I have tried both of these save type files
(type 1)

(type 2)

For both the other .dds files in that .iff I used save type 2, as the files had transparency in them.

I am lost here
