Yes, I’m pretty sure if we make the topic 200 replies long, and we placed a house placement like this in between each post, Discourse would “do it’s correct magic” and load the content of those iframes just before the tags become visible.
Please forgive me for not posting 165 more lorem ipsum replies (
); but if you want more placements on that lorem ipsum test page, I will happily post ten more and make it around 35 ad placements, just for you (adding sagan ipsum and funny pirate ipsum too) 
before I tear that page down mid-week.
Note: If I change the house display banners to Adsense tags, I’m 99.9999% sure we will see zero Adsense ads (we should not, for sure) because Adsense will (correctly) not serve ads to a test page like this, only up for a day from scratch, and full of lorem ipsum text :). However, I guess if I did something “goofy” like that, Google would not be happy with our Adsense account :), so kindly forgive me for not putting Adsense tags up on that lorem ipsum test site.
Note: I have intentionally omitted discussing how the Adsense crawler processes javascript and infinite scrolling pages. If interested, my suggestion is to Google search on the interesting topic - how the Adsense crawler responds to (processes) infinite scrolling pages.
See above discussion on why Adsense will not “be visible” on these “tossed up” lorem ipsum test pages.