Lets get a bit of perspective on this. LBA want to attract holidaymakers living in the Teesside area into using their airport over NCL. MME is not presently a viable option as we are all aware.
At no point does this say that Middlesbrough will be using LBA for their flights and in fact they flew back to MME last night after winning at Watford. If Boro get promotion, it will probably be beneficial for MME with more overseas visitors (mainly foreign media) going to games at the Riverside.