It's incredibly selective and has zero context.
Moving games in which he came on late and we didn't concede into the "didn't play" column, because you're just manipulating the "per game" criteria by counting a two minute cameo as a game played without conceding:
2017/18 - 1 goal per game conceded when he was playing (15 games), 0.57 goals per game conceded when he wasn't (23 games)
2018/19 - 1.33 goals per game conceded when he was playing (30 games), 1.4 goals per game conceded when he wasn't (10 games)
2019/20 - 0.91 goals per game conceded when he was playing (35 games), 1 goal per game conceded when he wasn't (4 games)
2020/21 - 1.03 goals per game conceded when he was playing (29 games), 1.4 goals per game conceded when wasn't (10 games)*
2021/22 - 1.74 goals per game conceded when he was playing (27 games), 0.91 goals per game conceded when he wasn't (11 games)
2022/23 - 1.12 goals per game conceded when he was playing (17 games), 1.09 goals per game conceded when he wasn't (22 games)**
2023/24 - 0.89 goals per game conceded when he was playing (18 games), 1.68 goals per game conceded when he wasn't (24 games)
2024/25 - 0.27 goals per game conceded when he was playing (11 games), 1.7 goals per game conceded when he wasn't (30 games)
Through his entire career at the club, we average 1.11 goals per game conceded when he is playing and 1.27 goals per game conceded when he isn't. Up to the end of 2022/23, the average was 1.2 goals per game conceded while he was playing and 0.99 goals per game when he wasn't.
If you go from 2018/19 to the end of 2021/22, which is basically his stint as a regular starter, it was 1.23 goals per game conceded while he was playing, and 1.2 goals per game conceded when he wasn't.
Literally the only way to make out that Victor Lindelof had any sort of positive impact on our defensive contributions is if you, bizarrely, believe he'd have been a difference maker these past two seasons. Up until that point, we were conceding more goals per game with him in the team, even while he was at his supposed "peak".
* 14 goals conceded - 4 came after we went down to 10-men in that freak 6-1 loss against Spurs - it was 1 goal per game conceded while he didn't play, while we still had 11 men on the pitch
** 24 goals conceded - 11 came in the two freak results against Brentford and Liverpool (4-0 and 7-0) - it was 0.65 goals per game conceded while he didn't play across the other 20 matches