Yeah, that is very old info, for some reason google insists on finding docs and info for version 2.4 but not for 2.8 or 2.9, and that is aggravating, extremely, but is beyond our reach to fix it.
We do remove outdated info from the forum whenever we bump into it.
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Ping OK is the only thing you need, make a config and start wiring stuff.
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You might need mesaflash ONLY if you need firmware for:
-you want to use a Mesa 7i74 or 7i85 or add a 7i76 or similar
-you request special firmware that is not standard
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One major tip for wiring, do NOT wire everything and power the machine ON.
Follow the link i posted, wire stuff one by one as mentioned there, check and recheck, and only when making sure all is good, move on to wiring and testing the next thing on that list.