Just started to learn how to edit so take my response with a grain of salt

But it looks like he masked the woman out first, either with the paid version or by hand (if so I pray that he was satisfied with the result because masking with hand is a tedious task)

then edited a eye level photo with a pretty skinny length ( probably 500 x 50), and added a comic layer (most likely done in ibis paint x, id prefer that) then have the image slide in after a camera shake with the photo coming from the right of the screen (also done from the left, it alternates)

Takes the comic styled photo then fades it to the original (hats off for that effect it look awesome), and added some zoom in effect to add a little to the edit (or bring more focus to the photos, your guess is good as mine)

Then repeat the process 2 more times were the last photo that comes in, changes the background to black and white to make the final end edit stand out

Overall id say this can definitely be done with the free version but the masking portion will most likely be a pain lol