To be fair, it’s not directly true, but it’s commonly done. You just start an offshore trust, sell the loss to them, by which means you realise it (even though you’ve just moved where it sits in your network of entities), and you can then write it down.

This definitely sits in “evasion” rather than “avoidance”, but it’s such a common practice that accountants recommend it like it’s just another normal service they offer.