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[Lif and the Treasure of the Tanones]

Thanks for the quick update!
A couple more findings:
Lif and the Treasure of the Tanones is on the archive https://archive.org/details/lif-and-the-treasure-of-the-tanones
Shadows by the Waterhouse (full or demo) is not an AGS game and should be removed https://www.adventuregamestudio.co.uk/forums/index.php?topic=58860.0
GrandMa Ep1 is actually the commercial game GrandMa Badass. Two demos have been released, the first one is impossible to find so maybe you can keep the entry
Trails and Traces: The Tomb of Thomas Tew is another commercial game, no demo available

[Antidote, The]

Hi, a few remarks about the list:

Antidote, The - Commercial game, available on steam. I don't think a free version was ever released
Epsilon Outcome, The - Same as above
Falcon City Released on steam, now delisted
Larry Lotter Test of Time Commercial, the free version was called Warthogs and is on the archive https://archive.org/details/warthogs
Metal Dead Encore commercial game, never released
Return To Monkey Island available on the house of mojo https://mixnmojo.com/media/files/Return-to-Monkey-Island--Guybrushs-Son
Symplokè Ch2 All three chapters are on steam. Only the first one is free
Sumatra FOY This one too is on steam and is the commercial remake of Pendek https://archive.org/details/pendek
Suli Fallen Harmony Now free on itch.io https://coutalgames.itch.io/suli-fallen-harmony
Submerged AKA LaSol Is available on itch.io or archive (it's the SE version but the mags version is almost identical)