The claim that oils rich in linoleic acid (e.g. seed oils) increase inflammation was looked at in, "a systematic review of randomized controlled trials that permitted the assessment of dietary LA (linoleic acid) on biologic markers of chronic inflammation among healthy noninfant populations was conducted to examine this concern."...
"We conclude that virtually no evidence is available from randomized, controlled intervention studies among healthy, noninfant human beings to show that addition of LA to the diet increases the concentration of inflammatory markers"
see: Effect of dietary linoleic acid on markers of inflammation in healthy persons: a systematic review of randomized controlled trials - https://pubmed.ncbi.nlm.nih.gov/22889633/
"We conclude that virtually no evidence is available from randomized, controlled intervention studies among healthy, noninfant human beings to show that addition of LA to the diet increases the concentration of inflammatory markers"
see: Effect of dietary linoleic acid on markers of inflammation in healthy persons: a systematic review of randomized controlled trials - https://pubmed.ncbi.nlm.nih.gov/22889633/