Based on my research, here is my analysis of the claim:

Reasoning:

• The claim states Erling Haaland was the top goalscorer in the Champions League "in 2023" with 12 goals¹²³⁴.
• The 2022/23 Champions League season concluded in June 2023, and Haaland was indeed the top scorer with exactly 12 goals in 11 matches for Manchester City⁵³¹².
• According to official UEFA statistics, Haaland led the 2022/23 season with 12 goals, ahead of Mohamed Salah (8 goals) in second place¹³.
• However, the phrasing "in 2023" is somewhat ambiguous. If referring to the 2022/23 season (which ended in June 2023), the claim is correct. But if referring to the 2023/24 season or calendar year 2023 alone, the top scorers were different⁶⁵.
• In the 2023/24 season, the top scorers were Kylian Mbappé and Harry Kane with 8 goals each, while Haaland scored 6 goals⁶.
• Haaland is Norwegian, which matches the claim's nationality specification⁷⁵.

Overall validity: 85%

1. Champions League 2022/2023 » Statistics: Topscorer
2. Erling Haaland in the Champions League: Records, stats, who he ...
3. UEFA Champions League - List of goalscorers 22/23 - Transfer Market
4. Top goalscorers by season Stats | UEFA Champions League
5. Erling Haaland career statistics, goals, video highlights, Man City ...
6. UEFA Champions League Scoring Stats, 2023-24 Season - ESPN
7. Erling Haaland - Titles & achievements - Transfermarkt