Indeed, these manpages are symlinked to apcupsd(8). See debian/apcupsd.links:
/usr/share/man/man8/apcupsd.8 /usr/share/man/man1/apcaccess.1 /usr/share/man/man8/apcupsd.8 /usr/share/man/man1/apcnisd.1 /usr/share/man/man8/apcupsd.8 /usr/share/man/man1/apctest.1 /usr/share/man/man8/apcupsd.8 /usr/share/man/man1/powerflute.1 /usr/share/man/man8/apcupsd.8 /usr/share/man/man1/smtp.1
There are more manpages in upstream source:
apcaccess.8 apccontrol.8 apctest.8 (not the one being installed) apcupsd.8 apcupsd.conf.5
Indeed, these manpages are symlinked to apcupsd(8). See debian/ apcupsd. links:
/usr/share/ man/man8/ apcupsd. 8 /usr/share/ man/man1/ apcaccess. 1 man/man8/ apcupsd. 8 /usr/share/ man/man1/ apcnisd. 1 man/man8/ apcupsd. 8 /usr/share/ man/man1/ apctest. 1 man/man8/ apcupsd. 8 /usr/share/ man/man1/ powerflute. 1 man/man8/ apcupsd. 8 /usr/share/ man/man1/ smtp.1
/usr/share/
/usr/share/
/usr/share/
/usr/share/
There are more manpages in upstream source:
apcaccess.8
apccontrol.8
apctest.8 (not the one being installed)
apcupsd.8
apcupsd.conf.5