At no point in the El Mundo article did he call the Germans "terrorists", and -- worse than hyperbolic -- it's irresponsible for you to suggest that he did.
Here's what Varoufakis said:
What they’re doing with Greece has a name — terrorism
[...]
Why did they force us to close the banks? To instill fear in people. And spreading fear is called terrorism.
My point, of course, is that these were both hyperbolic arguments.
"αυτό που κάνουν (οι πιστωτές) στην Ελλάδα έχει ένα όνομα: τρομοκρατία"
In greek, τρομοκρατία is a much less loaded term than "terrorism", even though it translates the same way. It's more "terror campaign".
The word "terrorism" in its more original form is ruling by fear and it can mean many things, such as being given power because the population is afraid of what you might do if you don't get what you want. "Terorrism", by contrast, is a massively politically loaded word for a completely black & white "good vs evil" world.
I know bloody well what the original meaning of "terror" was (you translate lots of sentences about terror and tyrants when you start studying Latin). The shift in meaning in English from the Latin meaning to the current meaning happened a long time ago.
I can also inform you that I just tried googling "tromokratia" (which google and/or chromium helpfully offered to transliterate into proper Greek). I got all the expected hits for the current English/German/etc meaning. The Wikipedia page lists all the usual greatest hits: Lockerbie, Timothy McVeigh, 9/11, London, Madrid. There is no hint what so ever that the usual or even just non-obscure meaning would be "fear-monger", as MaysonL suggested.
I think Varoufakis /meant/ terrorism and some people are backpedaling for him...
Greece needs the equivallent of Marshall plan. The troika wants to keep the Greek oligarchy in power and does everything in their power to keep the current status quo.
So generally speaking, what the troika did was destroy a heavely indebted country instead of actually helping.
The Siemens scandal (google it please I'm too bored to write another summary) and Christoforako's case (Varoufakis talked about this with Scheuble) shows the real problem: Greece has it's issues of course, but the troika was never about helping, it was more about exploiting all along.
For example, there's no mention at all in your remarks about the well-known shenanigans that led to Greece joining the Eurozone (and camouflaging its debts) in the first place (with the connivance of certain large foreign banks). Or of the naked arrogance and condescending, hoof-in-mouth verbiage we've been treated to by certain foreign leaders (like Angela Merkel) in recent months.
Just simply: "look at those Greeks -- they're irresponsible, they're overspending, and now they're looking for another handout", basically.