But they were intentionally removed from the latest version, because the just didn't work reliably. I tested them thoroughly back then and they would not even decode from a perfect off-file audio reliably. They may function for a number of words but the signal synchronisation is quickly lost. So if you try them, go ahead and investigate bandwidth and speed, but don't trust the decoding performance, because it is simply not functionally implemented, even without the signal degradatiom of anon-air radio link.
Kim KD9XB had planned to try ODFM on his SW Radiogram show, but abandonded the idea because he came to the same conclusion that they were just not mature for a valid test.
If you need high data rates, I recommend the robust MFSK modes, e.g. MFSK64 or MFSK128. If that ain't enoush speed, try higher 8PSK or PSKR modes, they probably offer all you need in terms of speed, but at the expense of robustness. There just is no 'free lunch' in physics. And other than for speed, the OFDM modes would not be helpful anyway, I guess.
https://groups.io/g/winfldigi/message/36798