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.
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