I am trying to look into it. First the Buddha says He doesn't bow down to anyone, but this isn't true, from what I've learned, He makes prostrations constantly to other Buddhas as well as the Gods who pay Him reverence, when such homage is applicable. He is a very humble being and once even said killing Him would be less sinful than killing an animal prepared for sacrifice, because of how innocent the animal was. Someone that humble and Loving wouldn't have a problem of bowing down to someone. It is generally the demons of this world who tend not to prostrate before others, like in the Koran when Iblis didn't prostrate before Adam when asked to by God based on the excuse that Adam was formed from clay and Iblis was formed from fire, with a false sense of prestige in the matter. Buddha has no false prestige, He is like the servant of all, with no problems giving His Metta to others in whichever way they ask.
I am not sure how this text came about that claims is where we should get our monastic laws from it, but there seem to be some problems in it, however I am finding a few authentic Buddhist philosophical concepts in it as well, but these are basic things like the cause of suffering, etc. There just seem to be some problems with the whole text as one, it does not seem like an infallible treatise to turn to from what I've read. There seem to be a whole lot of problems with this text. For example here:
Around the same time, a number of Vajjian monks from Vesālī ate, slept, and bathed as much as they liked. Doing so, and not reflecting properly, they had sexual intercourse, but without first renouncing the training and revealing their weakness. After some time, they were affected by loss of relatives, loss of property, and illness.
This is not how the laws of karma work. The Sangha is not under a curse, and the Buddha does not curse others in such a way. Sex is a part of a Loving relationship with someone, it can even create an Eternal connection between two individuals, it is sacred and should be treated as such. Becoming a monk doesn't mean your sexual intercourse would become polluted, in fact becoming a monk cleans up your life, and if one had sex they would likely be better off karmically as a monk than as someone who was living a materialistic lifestyle doing it, because they would have less attachments. It may be a hindrance to full Spiritual Life, and I understand monks are supposed to give up on sexual intercourse for a time, but it is not evil. The more I read into this text the more it seems like the person who wrote it, was someone who wrote it based off of the ideas in their own life trying to distance the Sangha from material life, however often in a harmful, and sometimes very negative way, which gave rise to many alterations. Think about this whole thing like a human being, because that is what you are, that is what the Buddha claimed to be, and since you are a Buddhist helping other human beings, the proper moral framework has to be laid down.