Austria is playing very strongly in this series. They have worked so hard in 4 matches so far that it is no less than a whitewash for the opposing team, but they will succeed by victory even one match. They have set a target of 150 in every match, which was actually a weakness and poor, but their bowling could have been tough and good for them to which they would have tried to succeed. They have scored 144 runs in this match, which was a very easy target, due to which the Austria batsmen also played well and achieved the target and victory the match, and this shows their strength and hard work very well and they will have to keep themselves strong to succeed in the same way.
Yes you are right Austria has struggled with batting in this series mostly setting low targets of around 150 runs even though they have worked hard. However their bowling has been effective. In recent match they successfully chased down target of 144 runs winning their first game of series. This victory despite being easy target shows their potential and could be turning point for them to build on their momentum in future matches.
In this series, Austria won 3 matches by chasing and one win by setting a big target. It can be said certainly that Austria is a much better team than Belgium. If the target is small for any team, then those who chase will easily win the match without pressure. Belgium played big innings in two matches in the series, they did not win those matches either. Austria can be said to have performed well in both their bowling and batting in this case. After all Belgium is a new team in cricket, they need more experience and after gaining experience it will not be difficult to get good results in such matches.