Someone or something has been hashing over the last 24 hr and significant amounts of coin has been generated.
No. someone is sending coins to that address. You have no evidence it is Labcoin sending those coins.
It's enough coin generated that it does seem like someone is hashing with around 0.5-1TH but I'm not a math pro.
post your math on how you came to that conclusion.
If you have the block reward and pool hash rate and you know the percentage that Labcoin received from that block reward then you can estimate the hash rate. I don't have the equation in front of me because I'm not a math nerd but I'm sure someone here can explain it to you more thoroughly.