CalTopo is built for people planning routes and marking points off the beaten path — hunters, search-and-rescue volunteers, backcountry skiers — and it needs those points as real coordinates, not addresses. Google Takeout's saved-places export gives you a CSV of names and street addresses, with no coordinates attached, so CalTopo has nothing to actually plot.
MapsLinkQuest pulls the coordinates directly from the Google Maps list's own data, so there's no geocoding step to skip. Paste the share link, download either GPX or KML, and import it straight into CalTopo.
CalTopo brings each point in as an individual Marker, keeping the name attached, so they show up on the map exactly like markers you'd place by hand — editable, groupable into folders, and available for printing onto a custom map or exporting again to a handheld GPS unit.
On caltopo.com: open your map, click Import in the toolbar, and choose the GPX or KML file you downloaded. CalTopo brings in each point as a Marker automatically.
On mobile: the CalTopo app doesn't support file import directly — import the file on caltopo.com first, then your synced map (and its markers) will be available in the app the next time it syncs.