I count 41 interview days as shown. Even inflating number of interviewees to 200 it's only 5 per day. Matching Josht's saying 5-6 slots per day but still very unusual.
It's tough to say now as several slots are obviously gone, but it seems there may have been days that act as either morning or afternoon sessions. Interviews start every 50 minutes starting at 9am. The only times that are now available are one of 9:00, 9:50, 10:40, 11:30, 1:00, 1:50, 2:40 and 3:30, the majority being those in the morning, and I don't know if I recall any at the 12:20 mark, and no days with slots in both morning and afternoon.
Again, it's hard to say as not all slots initially offered can be seen, but I believe this may be the case, meaning based on the 41 days the number goes back down to 164, more in line with expectation. Could be worth noting that not all slots are filled yet, so there may be an excess to still allow flexibility for late-picking interviewees, making it closer again to the 150.