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If Newcastle management had added talented players to the squad before the start of the season, we might not have seen their decline.
Newcastle become a rich club in the EPL, but players are still not sure about Newcastle's future potential. If this season Newcastle can improve its performance and at least can finished in 4th position, maybe in the summer transfer window, Newcastle can find better players than at the start of this season. Because there are prospects shown by Newcastle if they successfully compete in the UCL for two consecutive seasons.
Well if you come to look at it, they have actually tried very well themselves although they have the money like you said and having money is something like an advantage because they can buy the players they want but you can credit the management of the team because they have done exceedingly well compared to teams like Chelsea who had all the money and bought players but still can't put the Working formula together.