Summarized from Wikipedia:
Khao Khanab Nam are two karsts that are roughly 100 meters tall, separated by the Maenam Krabi River, located at the entrance to Krabi Town. The caves are found at the base of the right-hand karst and have the same name. The only way to reach these caves is by hiring a Longtail Boat at the Krabi Towns Chao Fa Pier, and the trip takes about 15 minutes. The caves are accessible only by boat, and the journey on the river in a traditional longtail boat and the visit of the caves with incredible stalactites and stalagmites make this an interesting visit. However, humanoid giants are not real and their origins are mainly found in folklore, mythologies, and fairytales from around the world. Taiwanese artist Tu Wei-cheng has created an "excavation site" in which a giant, outsized skull and bones, has been dug out of oblivion. The artwork was given special clearance to be displayed at the Khao Khanab Nam Caves.

REUTERS FACT CHECK:
Giant skeleton is not real, but part of an art exhibition | Reuters
reuters.com
› article › factcheck-giant-skeleton › fact-check-giant-skeleton-is-not-real-but-part-of-an-art-exhibition-idUSL2N2OD161
July 1, 2021 – The false claim that an image shows the archeological discovery of a giant skeleton has reemerged on social media.

SNOPES:
Was the Skeleton of a Giant Battling a Serpent Found in …
Snopes
https://www.snopes.com › Fact Check
Claim: A photograph shows the skeleton of a giant who died battling a large serpent.
Fact check by Snopes: False

There you go… if the fact checkers say so it must be an art installation… right?

Thank you,
God bless you.