* "De Profundis" was a personal letter: It was written by Oscar Wilde to Lord Alfred Douglas, also known as Bosie, while Wilde was in prison. The letter wasn't intended for public consumption.
* Wilde's will: Wilde's will stated that "De Profundis" should not be published until after the death of both him and Bosie. This suggests that he may not have wanted Bosie to read it during his lifetime.
* Publication history: "De Profundis" was first published in 1905, after Wilde's death, and was heavily edited. It's unclear if Bosie saw the full, unedited letter before this.
There are arguments on both sides:
* Arguments for reading: Bosie was the intended recipient of the letter, and it seems likely that he would have read it at some point, perhaps privately.
* Arguments against reading: Wilde's will suggests a desire to keep the letter private, and the fact that it wasn't published for some time after Wilde's death could indicate Bosie didn't see it.
In conclusion:
It's impossible to definitively say whether Lord Alfred Douglas read "De Profundis." There's no concrete evidence either way, and the question remains a matter of speculation.