most of the Britsh newspaper articles are pointless gibberish. They haven't actually worked out what the problem is and many are just trawling Twitter for quotes, and that's never a good idea! And American articles are likely to been copied from British.
The biggest problem is at departure Passport Control. But we get newspaper space fillers featuring unverified quotes about queueing to use the E-passport gates at arrivals. And yes, stock agency photos of people waiting to checkin-in at Schiphol some time in the last few years.
Easyjet, who are a major operator at Schiphol, have issued no specific warning for there when they did warn about Barcelona, Milan and Lyon. And then they updated that to explain that the Barcelona problem is being made much worse because some security staff are on strike at weekends this month - so absolutely no guide to what may be happening anywhere else..
Schiphol themselves have no warnings about delays, although they do say check-in will be busy and you should try to check-in online or use the automatic kiosks. They track people passing through the security checks (I'm not sure whether that includes passports) and this week it has been around 12 - 14 MINUTES. KLM have no particular warnings either.