"Old school"?

The treatment of those who questioned the behaviour of the now infamous Ministry of Transport fraudster was atrocious. Two have spoken to Radio New Zealand anonymously. This caught my eye though:

"When we raised issues sometimes we were told 'you're only here to pay the invoices and if they're signed and approved that's all you have to worry about'.
"But we were old school - and we were loyal and we were conscious of it being taxpayer money."

Which infers they were loyal to the taxpayer. Good for them.

But if they are old school, what is new school??