How was that official?
That vote was just a “keep doing what you’re doing, with rules” resolution - didn’t seem the proper start of an official investigation.
A majority of the House passed it. That's what makes it official.
The fact that they keep doing what they were doesn't change the fact that House endorsed undertaking an impeachment investigation under the terms of the resolution.
The best you can get out the wording is that what happened before the resolution wasn't official. But we are now in the period of after the resolution has passed.