Help with understanding this unusual options activity

The below is from an Optionhacker.com recent alert:

Please help me understand what the Impact=4281/$483K is.

Also vega=$1170 . How is this converted to a dollar value?

I understand the rest of what's presented.

Many thanks for any help.

 

Looks like a lot of option greek gibberish with a lame ass description of the alleged trade.

 

Vega=($change in the position/1 vol change in the option).
I think impact is Volume*%Delta. It's represented in shares and in dollars.