Except that this is NOT APA7. APA 7 requires "Appendix A" bolded, centered on one line, and "Title of Appendix" bolded, centered on the next line - not with a colon as showed here (APA 7 p. 64, 2.14).
One suggestion I would give to this video is to get onto the topic faster. The video was titled Appendices, not how to format an entire paper with every kind of heading. Sorry to be blunt. Thanks for the information stated in the title though.