The Express seems a very interesting first vehicle for bmir to choose to communicate this information!
There seem to be different ways to interpret the article. When they talk about the 'business leisure' market, I take that to mean people tacking on a long weekend to a business trip and perhaps being joined by partner/family. This might suggest adding capacity in certain markets on Thursday/Friday evenings and Sunday evenings or early Monday mornings. Alternatively 'business leisure' might be interpreted as premium leisure markets such as Switzerland and the Nordic countries.
We know that bmir already operates some charter flights (arguably to premium leisure destinations ex BRS), but if they are targeting Monarch routes/clientele that is indeed a different model from Alitalia, some of whose routes would in theory be a better fit for bmir's more business-focussed core operations.
It seem likely that LH will have a major role to play in cleaning up the Air Berlin mess, but for anti-competitiveness reasons it may be more palatable for BM to pick up some of those short haul routes, with appropriate codeshares, rather than seeing an ever increasing number of LH or Eurowings aircraft, particularly in Germany.