Ss this something I need to worry about?
Would this decrease the value of the home even if the sellers were to follow the fix?
It's an engineering report, and it recommends a specific remedy to correct a deficiency (It is spelled out in the Summary). Any structural defect should be addressed.
If you want a 2nd opinion, you'll need to hire an engineer for an on-site analysis.
As to future property value, that's not provided by inspectors, so you should consult with an appraiser or a local real estate agent.