Yes, the wallet.dat file is from the zcashd full node. Syncing a zcashd node with your wallet.dat in the data directory is the most straightforward way but requires actually running a full node which requires a bit of disk and to download and verify over 280GB of block data. But, if you’ve got the space then that should work.
Other potential options but are currently in development (caution):
Zmigrate is made to extract funds from wallet.dat files. This comes from ZExCavator (probably the one you want) and ZeWiF.
Zallet is the replacement for the zcashd internal wallet but it doesn’t describe using that particular file so stay tuned there.
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