When I worked as a strategy consultant in the Netherlands (albeit decades ago), the rule of thumb was that any organization that had not seen a reorganization for five years would accumulate at least 10% of dead weight. (Mainly due to very strict labour laws that make it very costly to fire someone.)

ASML has 44,000 staff total, not sure how many are managers, but the 1,700 number does not strike me as particularly ambitious for a reorg in a company that size.