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Yes, the unit will enter the `failed` state if either one of those failed.

You verify this with a test unit like this:

```ini
[Unit]
Description=ExecStop failure test

[Service]
ExecStart=echo I might just fail in a sec!
ExecStop=exit 1
ExecStopPost=exit 1
```

Documentation wise, apparently this excerpt in [`ExecStart`](https://www.freedesktop.org/software/systemd/man/latest/systemd.service.html#ExecStart=) applies to all the Exec directives:

>  If one of the commands fails (and is not prefixed with "-"), other lines are not executed, and the unit is considered failed.