Closest photo to that time-frame that shows the court dug up is 1/6/2018.
Too me it seems most plausible that they dug it up to remove evidence. They demolish a functioning Tennis court and leave the space fallow?
The "garden" is critical. It's why the berms where built, not for tennis, but to keep witnesses from seeing in, and perhaps as a magic mound building structure to contain the ceremonies. it is a ritual (sacrifice)site. Check out the QR epstein island thread:
>>7060032 -This anon is on point. Everything aligns to astrological, Saturn worshiping ritual significance. Also read the replies to their post.