For me there are 2 ways to look at this.
On one hands there are rules in the Vinaya and in the tradition that has been established from Buddha Shakyamuni's time and has evolved within various traditions and schools. Common to this is the practice of renunciation. The general rule of thumb is not to engage in lavish behavior. In other words, lead a simple life. In this respect, the usage of private jets, branded goods and fine dining can be deemed as lavish and a no-no.
The second point of view however, is that it is debatable on what is considered lavish and if the Sangha member; in this case the abbot himself, is actually renounced internally. After all, the Sangha should accept what is offered to them.
For this case, a deeper investigation need to be done to establish the actual motivation of the abbot.
A point to note is that in the Tibetan tradition especially, there are enlightened beings known as Mahasiddha who behave in what is normally unacceptable ways to benefit beings. After all, we are all flawed and do not have true wisdom to judge.