I don't think that's enough to say they will spend too much money on Newcastle, I know the owner of Newcastle are rich and they have enough money to buy the best players in the world for their team because we saw how Saudi teams spend money in this season.
Since Newcastle is going to be in the next champions league, I think if the NBewcastlw owners want to spend money for this team, now is the best time when they need more investment in their team to race in the Champions League.
Newcastle were able to compete in the top spots of EPL although they don't have top players like the other clubs. The market value of the team is like the half of Manchester City, United or Arsenal, yet they figured out how to play good together.
Eddie Howe managed well the club. There is few rumours about other players potentially coming to Newcastle, most of them are young. Newcastle are looking for the medium term in order to get EPL or Champions League title if possible.