The Intel IG found the threat credible.
No, Atkinson did NOT find there was any credibility to the claim.
Under oath before his Confirmation hearing Atkinson stated if there was ever any question about the credibility of a complaint he would bring the issue up to the SENATE Intel Committee as required and discuss it. Instead, he immediately called Adam Schiff and the HOUSE Intel Commit which is run by liars, classified Info leakers, and Impeachment-crazed Democrats.
Atkinson, btw, worked as a Deputy Lead in the DOJ section that handled / controlled the 1st FISA Court request filing - yeah, he was ass-deep in the Obama failed coup attempt. His boss was forced to resign when he was questioned about his handling of the FISA Court request. Under oath, former FBI Agent page testified that McCabe and she was briefed by Atkinson's boss...and him...on the status of the Trump investigation / coup attempt.
Interesting how so many coincidences such as the same people always being at the heart of scandals / coup attempts / etc...like Atkinson is here.