2021-03-05 23:46:00 UTC
The ancestry for Friedrich IV going back four generations to Diethelm I Graf von Toggenburg (fl. 1210-1229) is outlined in Genealogisches Handbuch zur Schweizer Geschichte, I (1908): 46-50. This outline (which can be accessed at https://archive.org/details/genealogischesh01gesegoog/page/n53/mode/2up) has the advantage that it actually cites original charters and other sources for all of its genealogical claims. I have followed the citations and have found the conclusions to be sound, at least as far as the paternal ancestry is concerned.
Cawley, in his February 2021 update to "Swabia: German-Speaking Switzerland" (https://fmg.ac/Projects/MedLands/SWABIAN%20NOBILITY.htm#_Toc514513201), provides the same ancestry (though with different numbering of the individuals) and gives much the same documentation. As he closely follows the Genealogisches Handbuch (except in expressing doubt on some of the conclusions concerning wives) he seems to have gotten this ancestry correct - and thus this is a case where Cawley/Medlands offers more at present than genealogics.org.
I understand there are members of this group who have been in contact with the current operator of genealogics.org. Is this something that might be of interest to him?