Can my employer pay for my health insurance coverage?
An employer can't pay for a plan an employee choses if they have to comply with the employer mandate, but can reimburse a group plan. Employers can't "use healthcare arrangements to satisfy market reforms by reimbursing employees for individual health plans" in general, but those who don't have to comply with the mandate can look into carefully structured section 105 workarounds as described in the link below (it is too complex a subject for a simple answer).
The general intent of this rule is to ensure that employers don't simply have employees shop on the Marketplace with subsidies and reimburse them (using tax payer funded subsidies to skirt their employer responsibility).
A large employer should offer a health sharing arrangement with a group health plan. A small employer won't get hit with a fee for misunderstanding this rule, but they still should make sure they are complying with the rules correctly moving forward (that means offer a group plan unless you are very sure you know what you are doing with a section 105 plan).
You can read about the rules for employer health care arrangements like Employer payment plans and HRAs here.