there were no public statements from Prince Harry specifically mentioning Prince William and his panic attacks. However, it's worth noting that Prince Harry has been candid about his own struggles with mental health, including anxiety and grief, particularly after the death of their mother, Princess Diana.
In recent years, both Prince Harry and Prince William, along with other members of the British royal family, have been actively involved in raising awareness of mental health issues and promoting mental health support through initiatives like the Heads Together campaign.
Since my information is not current, there might have been developments or statements made after 2023 that I'm unaware of. For the latest and most accurate information, I recommend checking reliable news sources or official statements from the involved parties.