Yes.
Most (not all) of the old menu is there (alas, not my Osaka-style battera), and the regular mustached Mexican dude is behind the counter. No word on the mystical and supremely talented Koizumi lookalike gent (owner?) who used to appear late nite from time.
What I had was fine, maybe a 1/2 step off, but I stuck to my core old-school sushi standards - saba, natto, fried oysters. I did also try the interesting sun-dried herring roe, kazunoko, which I thought tasted like a milder bottarga and is not something I remember from the old menu - nor is it something much seen on sushi menus here.
The narrow Shiroi space is not nearly as pleasant as the old spot, and it doesn't look as if the Matsuya crew did anything with the place other than change the sign. The cluttered room could use some polish, and the turnover would have been a good opportunity.
When I was there midweek, plenty of nostalgic Matsuya faithful seemed to be on hand.