So NEGATE MINED in 1.0.2

In v1.0.2 the Sapper and Engineer both acquired the NEGATE MINED keyword.

Does this mean they are now permanently immune to triggering mines by stepping on them, and can now only trigger them by failing to diffuse?

In 1.0.1 it was stated that only the ones who set a mine was unable to trigger it, now anyone with NEGATE MINED is unable to trigger any MINES set by anyone else, even for Scenario placed mines.

Am I interpreting this wrong? This sounds like a really big buff for mine based teams (which im happy about btw)