I think it's "lying" if you mislead another person.

In those two examples: serverless and wireless phones, it's not misleading consumers.

Serverless is a way to communicate that the consumer won't need to provision and maintain servers. It is true.

Wireless phone means you can move for quite long distances while talking without any wire connecting your device to the wall. It is true.

You may argue they're "misnomers". But to call it a "lie" is quite a stretch...