99 44/100% of the time I am 100% sure of what I write as I state it. ;-)
Seriously, if someone says they cannot do CZ sequencer dumps and re-loads using sysex, they must not be doing them the way I have done them over the decades.
As we have discussed before, this is an open forum and you can doubt my word if you want. I just offer facts, opinions, suggestions, etc. in case they help people who are trying to do things. As someone once said, "Take what you find useful; ignore the rest."
I have not checked the links you provided, but if they say it cannot be done plain and simple, I think they are misstating something.
Technically, you could say that none of the CZ data exchanges that involve hand-shaking work because from the get-go, Casio got that final F7 [sysex EOX] wrong in their implementation. (I won't explain that here, but it is legendary!!!!!)
However, to claim that "Sysex on Casio CZ gear doesn't work" is inaccurate / misleading / erroneous / not factually true / false (JMO). Claiming that "Casio's CZ sysex handshaking protocol varies from they way sysex was supposed to work and in some cases requires small work-arounds" conforms to my understanding.
As always, I could be wrong. In this case, I stand by what I say with 99 44/100% certainty.
Steve