Part 125/121 training V Part 141 training
If the organisation is a Part 141 then the ten hours may not apply, but if you are completing a type rating for something such as a B737 or A320 the type conversion going to greater than 10 hours anyway.
However if the operation is able to do ATPL issues under its part 119 exposition as a part 125 or 121 operation and do not hold a part 141 then you would have to follow the ten hour requirement, because you would have to become an "employee' temporarily to complete the training as they cannot sell the training to an external.
Part 141 = you can sell training externally.
Part 135/125/121 = you can train your own people only.
So it is likely that Air2There may not have Part 141 for training, I don't know what their approval status is.