Traditionally, platform engineering refers to a design optimized around creating and maintaining multiple versions of a product with different sets of features

Traditionally, platform engineering refers to a design optimized around creating and maintaining multiple versions of a product with different sets of features (and often different price points). Note that platform engineering refers to the design priority, not the implementation. For a dumb example, the implementation of free-profession-enterprise tiers for a web service might reflect platform engineering. Or the implementation might be totally ad-hoc. Or somewhere in between. To explain further, feature flags are a technique that can facilitate platform engineering. So platform engineering is a real and established thing. But that doesn't preclude it being used as a buzzword by someone who doesn't know what it is. Good luck.