She's 32 years old, has been fighting professionally for 8 years, and shown precious little improvement over her last 5 fights. This is simply what Aldana is.
A genuinely good striker doesn't go blow-for-blow with Bethe Correia, especially an old and out-of-shape Bethe, or Raquel Pennington. Nor does she go to a 50/50 decision against Lucie Pudilova.
No, that was just another bullshit talking point from the UFC talking heads. Aldana's takedown defense has always been a weakness; it's merely improved from "awful" to merely "average or slightly below average" in more recent years.
To be fair, them praising her takedown defense was less ridiculous than comparing Aldana to Canelo Alvarez and Julio Cesar Chavez.