vacuum_cost_page_miss (integer) -> read from disk or from outside of the shared buffers?

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/13/runtime-config-resource.html
Description:

hi, i am not sure if definition of vacuum_cost_page_miss paraemter on
https://www.postgresql.org/docs/current/runtime-config-resource.html is
correct. The current definition states: "vacuum_cost_page_miss (integer)
The estimated cost for vacuuming a buffer that has to be read from disk.
This represents the effort to lock the buffer pool, lookup the shared hash
table, read the desired block in from the disk and scan its content. The
default value is 10."
Shouldn't it be more like: "The estimated cost for vacuuming a buffer that
has to be read from outside of shared buffer cache" (including both disk and
OS cache?)