And yet Lindgren remained a committed Social Democrat even in spite of this. Drawing a parallel between her and a tax-dodging, fascist sympathizer is quite the leap. Lindgren despised the Nazism Kamprad embraced and never really fully repudiated.
Note that Ingvar Kamprad wasn't the only one to leave Sweden for tax related reasons in the 70-80s era. To name a few others: Hans Rausing (TetraPak), Stefan Persson (H&M), Ingmar Bergman, Björn Borg..
Essentially, there's an important and material difference between saying, "I'm a socialist, but these taxes, which I'll continue to pay, are excessive" and "I'm an unreprentant fascist who must hide my wealth from these undeserving thieves," even if the latter can opportunistically profit from the former's sentiment to justify their own actions.