He *could* be, yes. I`ve watched Haaland regularly since he broke through at 17 in Norway, and I`ve also watched most of Delap's games for the EDS (and first team), and in my opinion Delap is better than Haaland was at 17/18. I`m a Norwegian and absolutely love Haaland, so I don`t have a single good reason to downplay how good he is or was.
Haaland at Delap's age was still playing in Norway. Even though Haaland was playing against men, and Delap is mostly playing against kids, I don`t believe the Norwegian league is any harder than PL2. For instance, there was a young Norwegian over at Liverpool (Edvard Tagseth) who struggled for game time for their U18s, and left them in 2019 for Rosenborg, the best team in Norway. In his first full season he made 28 appearances for them, including some Europa League games. Lots of clubs in the Norwegian league field youth players (most of them far worse than the average PL2 players), in other words Haaland wasn`t exactly facing world-beaters. He got 12 goals in 26 appearances in his last season (at the same age as Delap is now), and I`m certain Delap would beat that.
There`s no one denying that Haaland is better than Delap to this day, but with the right coach and a good plan Delap could potentially reach Haaland levels. Haaland is quicker and stronger, but Delap is far more technically gifted, and has better linkup play, dribbling and passing (albeit a little inconsistent). Out of the 2, I think Delap is slightly more suited to our style of play, but Haaland is the overall better player at the moment and would be the safest bet to replace Kun on the short term