I will not judge a forward's quality from his PK taking. Even Messi has a relatively low PK conversion rate for a player of his calibre. FYI he missed 31 penalties out of 140 attempts. So I will not blame Lautaro for his abysmal penalty.
However, I do concern he could fall to the category of Immobile, Dario Hubner, Di Natale, and Quagliarella. They were a proflic Serie A strikers, but no one outside Italy give a shit about them. Lautaro flopped hard at the World Cup and his UCL record is starkly contrasted from his league record. Unless he improves this aspect, we will struggle to compete in Europe.