Given their CEO's bragging about extortion, blackmail and prostitution/pandering I'd give their assurances almost no value at all.

Hopefully the tests will prove that clearly.

A “forensic test” to check that they didn’t copy and hang on to some data in 2013 ... well I’m reassured.

Do you have a better idea? Be productive with your comments vs. just being a hater.

They are well aware there is no way to assure they haven’t copied data 5 years ago. Pointing that out with rightful indigence is not “being a hater”. (which isn’t a trope that belongs in reasonable conversation)

On this forum you are sorrounded by people with backgrounds in data storage and networking. Any one of them will tell you there can be no reliable “forensic” assurance the data was not copied somewhere by any number of methods, even for a recent timeframe, let alone 5 years ago. It’s a ridiculous idea on its face.

So you yourself have no expertise but are still going ahead with making an assertion and your bet is that if you are wrong others will pile in.

At least try to be reasonable.

no, myself included.