I haven't seen the documentaries, but I have read the accompanying book and I agree with Mulceber. Jones is not a little biased against the Romans. But that's the point. It's supposed to be an anti-dote against the Rome-biased popular history, which is derived in large part from 19th century historians that did not question the Romans' view of themselves. Hence it's called "history from a different point of view". Jones wants to make the point that the Romans could be just as savage and greedy as anyone else; and that the cultures they fought had their own share of civilized advancements.

However, since we are familiar with EB we don't need an antidote. Take everything he says with a pinch of salt.

As for the map, in the book Jones mentions that two of Caesar's murderers actually led a Parthian army against the second triumphirate, and succeeded in conquering a big chunk of Rome's eastern possessions. Maybe that is what the map refers to? The Parthians lost in the end, but if true it's telling that this episode of the Roman civil war has been swept under the rug. Most popular history makes no mention of a foreign power hijacking Rome's civil war.