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Note added at 45 mins (2022-06-13 06:32:01 GMT)
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اصل جملۀ زیر
Less good, they opined, on their own.
به صورت
They opined I had done a less good job on their own work.
می باشد که در تقابل با جملۀ ماقبل خود یعنی جملۀ
They thought I had done a good job on other peoples’ work.
می باشد
و
“I’ll take that” means I agree with them or I accept what they're saying.