Is [name withheld] on the right track in practicing his Sanskrit mantras? Are these truly divine ways to empower humans and keep them connected to divine realm?

Some are and some are not. This is the problem with ancient lore. It is often a mix of the divine and the would-be divine, proffered as genuine but falling short because of a clever alteration to create a fuzzy connection to divine realm and keep the attention focused on the practitioner and their desires as being the entirety of what takes place. This, as you know, will leave the human very much on their own, wanting to carry out world-level healing for the individual or the collective, and the human will not be up to the task of saving humanity. They must reach divine realm and engage with divine realm for that to happen. So his work would require a step by step vetting to truly know what is useful and what is much less so. But this is a good example of why old teachings need to be updated through a reliable source, otherwise, they have many pitfalls and limitations and will almost always under-deliver compared to what a truly divine practice can summon forth.