If it's a Chinese e-bike, it's probably lying about being IPX67. OTOH, Riese & Müller $15k USD e-bikes aren't IPX anything because the Bosch components aren't. If you get it wet, just kiss that money goodbye. Absolutely bonkers.
Huh, that’s not my experience. My wife rides to work on her R&M e-bike, every working day, all year round, in sun, rain or snow. Daily distance is about 40km (25 miles), two hours back and forth. Not a single major problem caused by water in more than 5 years.
https://www.r-m.de/en-us/service/faq/
Yes. You can use the system in the rain without any concerns. It is protected against rain and splashes, but not against riding through rivers when the motor is submerged in water.
Equivalent of about IPX54. To me, this means it's not really waterproof (IPX?7) should it fall a puddle when it rains. Never spray it with a garden hose or pressure washer while washing. And, it's really a gamble to take it in the rain. Plus, like cell phones, they tend to lose IPX protection when repaired because of customary sloppy repair jobs that fail to restore gaskets.