No, these are footblocks (see photo). This photo is before I did any of my recently completed deck repair and refinishing.
I notice that your mast base turning blocks are mounted higher that mine so you can get a proper mast boot over the opening. I have about 1/2" between the top of the collar and the underside of the blocks. Pterobyte you are right about the deck mounted mast base blocks pulling up on the deck. I've seen lightly built sportboats where tensioning a halyard changed the shape of the midsection of the boat - NOT GOOD.
I remember the days of mast mounted winches and winch clusters around the mast base. One of the first boats on which I sailed had a cluster of 7 winches on the deck around the mast; 4 foresail halyards, a main halyard, topping lift, and cunningham. This was on a 33 foot boat (Morgan 33T, an IOR 3/4 tonner). The foredeck crew (me) on a spinnaker takedown uncleated the spin halyard and took the tail with him to the bow where he tripped the shackle at the pole then flipped the halyard off the winch. We sailed with a crew of 6 without anyone assigned as mastman. Foredeck crew did it all.