As of my knowledge cutoff in September 2021, Del Loewenthal, a renowned psychotherapist and academic, has not specifically spoken about decolonizing therapy. However, it's important to note that my information might not include the most recent developments or statements made by individuals. Del Loewenthal has written extensively on various topics related to psychotherapy, including relational perspectives and existential therapy. It is possible that he may have addressed or written about decolonizing therapy since then. I recommend checking recent publications, interviews, or other sources to obtain the most up-to-date information on his views regarding decolonization in therapy.