VS BE fares are still showing as completely non-changeable and non-refundable. Unlike DL BE fares which will now be changeable and partially refundable for a credit with a fee. So you may be able to continue to earn miles on VS T fares, but you probably won't be able to cancel/change them at all.

For some history, DL did a reduction of BE fare differentials on many domestic routes on August 12th from $40 to $25 each-way which is now pretty much the standard (more competitive routes out of LAX and SEA were generally already in the $20 to $25 each way range). TATL fares also had a reductions from $100 each-way to $75 each way somewhat later in the fall. AA eliminated BE fares on most domestic routes in the Fall of 2020. UA has also been reducing BE fare filings on many routes and DL was likely facing pressure on their BE fares between it's legacy peers and LCC/ULCC competition. Only AS seems to be a holdout at this point and many transcon routes continue to have a $50 differential each-way.