Strange.
No reference or name for this tidal station near to Pattaya (wherever it is) and any relevant source data for it. Also no mention of several relatively recent but significant Pattaya beach remedial works due local storms overwhelming the drainage system from time-to-time, with the consequent flood waters running as rivers on to the beach to erode and ruin it. The reason for any shoreline "retreat" is probably mainly because there is less material (sand) due to erosion, despite all of the replacement sand brought in.
This quoted Pattaya sea-level rise of 14.2mm/y is a lot, and double that quoted down south, so I see it as questionable. This rate is also more than double the average value (6.5mm/y) for Thailand that the same authors cite in a "related" paper linked below. In it they do mention the beach "nurturing" (bringing in a bunch of sand/partial replacement for Pattaya) but this paper was submitted 2 years later.
https://www.mdpi.com/2077-1312/9/6/588
Even stranger!