The reach argument holds even more true for MFT with its x2 factor.
I organised a 920mm reach but wouldn't do more than play with it becuase with the 'safe' wildlife I occasionally shoot I will get better results with a much shorter lens from a hide.
With Andre being in South Africa I guess he is thinking of 'Un-safe' animals from which you need to keep your distance although if you can entice the animals to near your vehicle then FF and a short lens will be better ... same as me working with APS about 18" from the birds rather than my 950mm reach bridge camera.
The answer I think is how you intend or are able to go about it.

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I wont be going though all of his shots to see if a more recent crop camera has been used but if you think about it apart from pixel size issues when say the wanted bit only fills 1/2 or less of a full 35mm frame 4/3 may as well be used.
None of this could possibly relate to advertising or sponsorship could it. Of course not.