With token you will see both public and those shared within organization only ( what ever your arcgis online credential allows you to see )
with token I can see 350 layers
https://transparentgov.net/json2tree/esri/server2/searchLayer.html?org=https%3A%2F%2Fservices.arcgis.com%2Ff48yV21HSEYeCYMI%2Farcgis%2Frest%2Fservices&url=https%3A%2F%2Fservices.arcgis.com%2Ff48yV21HSEYeCYMI%2Farcgis%2Frest%2Fservices&select_folder=1&select_layer=0&arcgis_online_token=&filter_by=
Without token you will see only public content ( shared with everyone )
without token I can see 192 layers