Sure, here are the claims you mentioned, followed by peer-reviewed sources for each:

Claim 1: "Nearly 95 percent of kids who say they are trans and don't receive any form of affirmation literally shake it off."

Response: This claim seems to be referring to the idea that many children who experience gender dysphoria may no longer identify as transgender later in life. While it is true that some children who express gender dysphoria in childhood do not go on to identify as transgender adults, the exact percentage is difficult to determine. However, it is important to note that a lack of affirmation and support can have negative consequences for children's mental health and well-being, regardless of their gender identity.

Source: Olson, K. R., Durwood, L., DeMeules, M., & McLaughlin, K. A. (2016). Mental health of transgender children who are supported in their identities. Pediatrics, 137(3), e20153223. https://doi.org/10.1542/peds.2015-3223

Claim 2: "As of right now, we don't have good statistics about regret because the current generation is the testing group."

Response: It is true that the long-term outcomes of medical interventions for gender dysphoria, such as hormone therapy and gender-affirming surgery, are still being studied. However, existing research suggests that the vast majority of individuals who undergo gender-affirming treatment are satisfied with the outcomes and experience improved mental health and quality of life.

Source: Murad, M. H., Elamin, M. B., Garcia, M. Z., Mullan, R. J., Murad, A., Erwin, P. J., & Montori, V. M. (2010). Hormonal therapy and sex reassignment: a systematic review and meta-analysis of quality of life and psychosocial outcomes. Clinical Endocrinology, 72(2), 214-231. https://doi.org/10.1111/j.1365-2265.2009.03625.x

Claim 3: "The entire conversation of mental grooming comes to existence."

Response: The term "mental grooming" is not a recognized or commonly used term in the field of psychology or psychiatry. It is unclear what this claim is referring to or what evidence supports it.

Source: N/A

Claim 4: "Your brain doesn't fully develop until you are in your mid-twenties, but yet it is thought as okay to literally chemically castrate children for the sake of affirmation?"

Response: While it is true that the human brain continues to develop throughout adolescence and into the mid-twenties, medical interventions for gender dysphoria are carefully considered and typically involve a thorough evaluation by a team of medical and mental health professionals. These interventions are not undertaken lightly, and their potential benefits and risks are carefully weighed on a case-by-case basis. Hormone therapy for adolescents with gender dysphoria is considered a safe and effective treatment option by major medical organizations, such as the World Professional Association for Transgender Health.

Source: Hembree, W. C., Cohen-Kettenis, P. T., Gooren, L., Hannema, S. E., Meyer, W. J., Murad, M. H., ... & T'Sjoen, G. (2017). Endocrine treatment of gender-dysphoric/gender-incongruent persons: an endocrine society clinical practice guideline. The Journal of Clinical Endocrinology & Metabolism, 102(11), 3869-3903. https://doi.org/10.1210/jc.2017-01658