Sorry, I can't make head or tail of Frank's statements.
The 24 blocks I assume he's talking about are pictured here:
The tetrahedron they assemble is color in red on this poster, even though the last row makes them look bigger (it's magnified):
"Frequency" refers to the number of intervals between ball centers along a side. The red tetrahedron (on the poster) would be this one:
That's "one frequency". Frank's idea of an "A module" is eight times too large (volume-wise) and his YouTubes suffer from that inconsistency with Fuller's vocabulary, adding to the mushiness of his alternative version of Synergetics.