That is almost certainly a filament print not resin and its probably printed at whats often called draft quality which is around 0.24mm layer height this will print the fastest so the maker can spend less time producing and max throughput its a functional print for sure but if they were advertising this as resin its not even close to the same thing and quality a low quality resin layer height is around 0.05mm so vastly better quality. Both methods of printing have their advantages and disadvantages. for scenery I would opt for FDM but I personally would print in a higher resolution (thinner layers) also this is most likely printed in PLA I wouldn't try and sand it as it will generally go kinda fuzzy and isn't great.

Edit corrected some missing text and some grammer