From a first glance at the abstract:
Compared:
people who got covid in Jan-Feb 2021
people who got vaccine in Jan-Feb 2021
Looked at how many got covid in June 1-Aug 14, when Delta predominant
Result:
Those who got the vaccine were 13 times as likely to get covid
Conclude:
Those with natural infection are better protected, (but this is looking at just 3-7 months after infection).
Compare:
people who got covid in March 2020-Feb 2021
people who got vaccine in Jan-Feb 2021
Result:
Those who got the vaccine were 6 times as likely to get covid
Conclude:
Immunity is waning after the natural infection, but not as quickly as it wanes after the vaccine.
Overall conclusion:
Natural immunity confers longer lasting and stronger protection against infection, symptomatic disease and hospitalization caused by the Delta variant of SARS-CoV-2, compared to the BNT162b2 two-dose vaccine-induced immunity. Individuals who were both previously infected with SARS-CoV-2 and given a single dose of the vaccine gained additional protection against the Delta variant.