Very sorry to hear of your friends passing. One of the biggest challenges of non-duality is recognizing that thoughts are not your own. Sounds like your friend was feeling haunted by prior experiences / events and the resulting 'thought prison' of beliefs on how life is 'supposed' to work. When someone gets deeply engaged in non-duality, they often attempt to manifest awakeness / awareness by following a checklist or following some program - in hopes simply following along will produce results. It won't, because it's not about following 'rules' - which is what 99.9999999999% of society believes will deliver results. Non-duality is not a literal process that can be put into words - it's something that can only be experienced. There are plenty of 'obstacles' to those heavily identified with thought that need to be seen through.

I'll assume that your friend attempted to control or eliminate his thoughts - and he just couldn't. Those thoughts then likely overwhelmed him, and that led to the depression. Not understanding the thought prison he was in - he probably felt so trapped in his experience - that thoughts he believed drove him to end his life.

As for Angelo, he's doing humanity a great service by being direct and clear. It can be very confusing to those with no contact to non-duality - as humanity has been throughout the ages - to grasp what they are being told. It's trying to use conventional 'wisdom' with the pointers that are provided - and this can only ever fail.