Here's a preprint by some of the same authors as the main article. Figure 5 compares to influenza:

https://www.researchsquare.com/article/rs-1062160/v1 Long Covid after Breakthrough COVID-19: the post-acute sequelae of breakthrough COVID-19 by Ziyad Al-Aly, Benjamin Bowe, Yan Xie

Figure 5 is "Risk and 6-month excess burden of post-acute sequelae by organ system in people who were hospitalized during the acute phase of breakthrough COVID-19 compared to those hospitalized with seasonal influenza "