Lots of errors "No supported implementation in PYTHON_COMPAT."

[jjakob]

I'm using this overlay as a repo with layman for www-browsers/vimb.
Recently it started causing a lot of errors in equery:

gentoo ~ # equery d -a goffice
 * These packages depend on goffice:
app-office/abiword-3.0.4 (goffice ? >=x11-libs/goffice-0.10.2:0.10)
app-office/gnumeric-1.12.48 (>=x11-libs/goffice-0.10.48:0.10)
app-office/grisbi-1.2.2 (goffice ? >=x11-libs/goffice-0.10.0)
 * ERROR: dev-python/aiofiles-9999::tharvik failed (depend phase):
 *   No supported implementation in PYTHON_COMPAT.
 *
 * Call stack:
 *                ebuild.sh, line 609:  Called source '/var/lib/layman/tharvik/dev-python/aiofiles/aiofiles-9999.ebuild'
 *     aiofiles-9999.ebuild, line   7:  Called inherit 'distutils-r1' 'git-r3'
 *                ebuild.sh, line 314:  Called __qa_source '/var/db/repos/gentoo/eclass/distutils-r1.eclass'
 *                ebuild.sh, line 112:  Called source '/var/db/repos/gentoo/eclass/distutils-r1.eclass'
 *      distutils-r1.eclass, line 105:  Called inherit 'python-r1'
 *                ebuild.sh, line 314:  Called __qa_source '/var/db/repos/gentoo/eclass/python-r1.eclass'
 *                ebuild.sh, line 112:  Called source '/var/db/repos/gentoo/eclass/python-r1.eclass'
 *         python-r1.eclass, line 260:  Called _python_set_globals
 *         python-r1.eclass, line 199:  Called _python_set_impls
 *   python-utils-r1.eclass, line 156:  Called die
 * The specific snippet of code:
 *                      die "No supported implementation in PYTHON_COMPAT."
 *
 * If you need support, post the output of `emerge --info '=dev-python/aiofiles-9999::tharvik'`,
 * the complete build log and the output of `emerge -pqv '=dev-python/aiofiles-9999::tharvik'`.
 * Working directory: '/usr/lib/python3.8/site-packages'
 * S: '/var/tmp/portage/dev-python/aiofiles-9999/work/aiofiles-9999'

this error is repeated a lot of times for different packages in this repo.
IIt seems to be connected with using old python2.7 ebuilds. https://forums.gentoo.org/viewtopic-t-1129356-highlight-pythoncompat.html