Is Anker approved by apple so it won’t void the warranty?

Above is correct.

Anker offers various Apple MFi-certified cables.

MFi is an Apple peripheral certification program for cables and other connected devices.

I have used Anker cables, and have had no issues.

Identify counterfeit or uncertified Lightning connector accessories - Apple Support

Anker makes excellent products and using their cables and/or charging bricks won't void any warranty you have with Apple.