Some of these ancestry sources aren't useless, they cite the original documents/index .
S-1530372185 " Class: RG 9; Piece: 1599; Folio: 65; Page: 3; GSU roll: 542837." If you follow the link it takes you to the same page which tells you (rightly) that this is the 1861 census. (it's the official ref) With that reference and especially with the info in the bio that he was living at St Levan in 1861, the page is easy to find elsewhere.
BUT I note that ref 9 is actually to a transcription of the same census.
S-1530372182 is to the free BMD death index
If I had no personal interest in the profile, I would leave it as is. If I adopted the profile. I would alter the references eg a citation to te 1861 census something like this
1861 census Civil Parish of St. Levan, Eccl. District of St. Levan Class: RG 9; Piece: 1599; Folio: 65; Page: 3; (the GSU roll index is an ancestry ref and can be omitted) image viewable on ancestry, full transcription Susan Hoyle and Mark Hattam , Cornwall OPC http://freepages.genealogy.rootsweb.ancestry.com/~kayhin/61599a.html
For the Free BMD I would refer to the free BMD site or the free GRO site, (nowadays the latter because it gives age at death, even with the earlier deaths, though it requires registration to search and view)
GRO index of deaths DAVEY, JOHN 52 GRO Reference: 1902 J Quarter in TRURO Volume 05C Page 107 https://www.gro.gov.uk/gro/content/certificates/menu.asp
When I had done this I would be able to remove those ancestry refs with no loss of information.(NB It is my personal decision to use charitable or government sites in preference to Family Search when there is an alternative)
Not sure what I would do about S-1530370364 which redirects to a private tree. Someone could use this to contact the presumably family member so I might leave the link under other sources (but reduce/alter some of the extraneous gumph!