Well I didn’t create that Wiki page, so I’m only just reiterating what it says on there.
According to that page it is, in whatever way you want to interpret that page as.
The only metric that page uses to define India as socialist is “makes a constitutional reference to socialism”. That can mean socialism is some end goal, or they just have policy inspired by socialism.
Having said all that, they are actually declaring they are socialists in their constitution, so even if they don’t get to it to a point where you think it’s socialist, they think they’re are already, or are going towards socialism.