It has nothing to do with genuineness test. The only reason for this change is to keep consistency between the rules and the Tier 1E guide. If you pay attention carefully the current guide says:
Company bank statement from a UK account which shows transactions for that company
However currently 46-SD(c)(ii)(2)
only says:
If the applicant is a director, a company bank statement showing that the company has a UK account, or a letter from ....
The change will bring the rules in line with what is
ALREADY mentioned in the guide but is missing from the rules. So 46-SD(c)(ii)(2) becomes:
If the applicant is a director of a UK company, or member of a UK partnership, a business bank statement from a UK account which shows business transactions, or a letter from ...
Advice is given based on my personal research and experience only. Do NOT contact me via private message for immigration advice