Well, you seem to be wrong about all three:

https://livejapan.com/en/in-tokyo/in-pref-tokyo/in-ikebukuro...

This article reviews three different boy's love cafés, in close proximity to one another.

I'm not sure how derive the conclusion that there is only one used underwear vending machine; a simple image search reveals many different models:

https://www.techinasia.com/japan-used-panty-vending-machines...

This article concludes that the most extreme stories about one at every corner are an exaggeration, but one can definitely find them.

As for the cafés without underwear: there is definitely more than one, though they've been on a decline.

https://en.wikipedia.org/wiki/No-pan_kissa

> https://livejapan.com/en/in-tokyo/in-pref-tokyo/in-ikebukuro...

Of the 3, only the first one is overtly Yaoi. I don't know the second one, but it doesn't seem like one, and the Butler cafe is definitely not Yaoi.

> https://en.wikipedia.org/wiki/No-pan_kissa

After the boom in the 80s (30+ years ago), are there really any left, with the glass floor and everything?

You also need to understand a bit of Japan. Ikebukuro is the womens/girls Akiba. So it's really normal to see the oppoiste of Akiba there. There are countless cafes there that cater to females, where in Akiba it is male.

And akiba is short for akihabara.

The underwear vending machine are out, and hidden now, mostly Akiba from what I hear on whispers, not in public. Maybe even one in Nakano broaddway...

And Kissa's in general are in decline, not just no pantsu kissas.

More like Akihabara is long for Akiba: https://soranews24.com/2018/05/26/why-is-akihabara-shortened...