Apparently the offshore visa processing office opened again on September 15th, it was closed for most of the year during which time no offshore visas of any kind could be processed, but I've no idea if there are any restrictions on what categories of visa can now be applied for from offshore but I've now found the applicable regulation and will need to translate it https://kemlu.go.id/download/L1NoYXJlZCUyMERvY3VtZW50cy9TZ3BGaWxlRG9jL0JOJTIwMTA0NC0yMDIxLnBkZg==My understanding is the B211A is not available offshore. Only the B211B. Onshore visa's can certainly be B211A
The difference between the B211A and B211B is that the B211B includes the categories of 'Providing guidance, counselling and training in the application and innovation of industrial technology to improve the quality and design of industrial products as well as overseas marketing cooperation, conducting audits, production quality control or inspections at company branches in Indonesia, and prospective foreign workers in trial' and it also requires approval of the Director General of Immigration which the B211A does not. All other requirements are the same.
The more you look the more confusing it becomes