I see nothing in that link to suggest that the Home Office doesn't consider the course to be "academic enough".... far less any indication that this is an attack by the Home Office on violin making.

Quote from link:

A college spokesman said: "The School of Musical Instrument Crafts is unable to accept new overseas students until such time that it regains its Tier Four Status.

"A strong focus on further improving education should mean an Ofsted 'good' grade when it is likely to be re-inspected in the spring. This will lead to it regaining its tier four status.

"As a result of these developments four overseas musical instrument crafts students will not be able to stay in the country to complete further studies.

"All will be given full accreditation certificates for the years they have completed, made an offer of compensation and be offered guaranteed deferred places at a significantly discounted rate when we regain our status.

"We are also exploring alternative UK training providers who could help them complete their studies.

"We are continuing to develop and invest in The School of Musical Instrument Crafts and we are working with Hull University to validate a degree-level course."

I would assume that all the students will eventually be able to resume their studies, and at the end of the day take their place in the (very lucrative) world of violin repair.