25 check airmen are not leaving next week. That's completely false. There will be a few check airmen leaving at that time but they're being replaced as we speak. There are at least 4 finishing up check airmen training within the next week or so.
In the coming months most of the check airmen will be leaving but will be replaced at the same time. Not sure why you're panties are in such a bunch over this. We are, however, behind in new hired pilot training.
That "guy" who told you that sounds like he was being dramatic or didn't know what he was talking about.