yes, the LSM9DS1 iNemo is an active product. However, due to the current shortage in semiconductor industry all over the world, the delivery of a few products to the distributors are delayed.
In general, to check if the product is active or nrnd I suggest you to surf the ST eStore that you can find on st.com.
In particular, if you need more than 500 devices you are invited to contact directly the sales offices and representatives from the contact page, in order to get more internal visibility in this shortage period.