[cgbg]

One reason for the “measures” (as the Brits call them) would be that they monitored his communications and found out he had specific damaging information that he had not yet released.

In that case his past articles would not be helpful.

[Mr Radical]

I don't think he has any 'inside' information, simply that he won't follow the official narative:
for example
PETER HITCHENS: One glorious day in Sevastopol 12 years ago, I saw what was coming. That's why I won't join this carnival of hypocrisy