The report stated that the stab trim was 1 unit out when the correct figures were used. That is not a large difference & wouldn't require excessive control input. I regularly have to apply back trim when getting airborne in the NG. The actual weight was less then thought, so the speeds were higher than needed, so no problems there. If the actual weight had been higher than what was used to calculate the take-off data, then that would have been a more serious issue.
The matter does need to be investigated & addressed, particularly so that systemic issues can be corrected. But to imply that there were serious safety issues with regard to the actual take-off & flight is a bit of a stretch.