Hi & welcome!
That is a messy, flared & stretched looking foot for a start. This is immediately after the farrier removed the shoe & before he trimmed I assume? Be interested to see the 'after' shots. I'm guessing it would probably have come up not too badly after a good trim, but can't tell much from just that pic alone. WLD can also be insidious & you don't know for sure how far it's gone until you 'go exploring'. If you would like a hoof critique, you need to provide a range of photos. See the link in my signature below for what is required. Some info on diet, management, etc is also helpful.
If the farrier said horse has 'WLD'(aka Seedy Toe), especially with all that excess stretched wall material, I hope he trimmed it 'assertively' and cleaned out the diseased wall material as needed, or, if it was his first visit to the horse & depending on what he found, he may have trimmed minimally for now but arranged to come do a proper trim & deal with seedy very soon? You can/should treat it topically as well, but it generally needs more than just topical.
See the other link in my signature, to the thread with some 'further reading' as I believe it's vital for owners to educate themselves about hooves & soundness, so that, among other reasons, they can understand the factors that affect function.