Basically there are 3 distinct things to consider:

Is the path clearly visible and usable?
Even if it's not, keep in mind that during the summer months grass can grow very quickly making it temporarily unusable. I've personally been there on autumn/winter/spring and it has been ridable with a bike.

Is the path a dead-end and completely blocked by the barrier next to the cycle path?
If it really is, then I would seriously consider deleting it.

Is it actually used?
The easiest way is to check Strava heatmap. It shouldn't display activities that are older than 12 months and it's updated monthly. On winter months you can also survey footprints on snow :D
