There are plenty of pioneers, elders and so on with smart phones, tablets, fit bits, Apple Watches etc. Sanderson is not unique in being a low income earner (supposedly) and having some more expensive tech. If he bought it then it's his business, he might even have got it at a discount as part of a mobile phone deal. If he was gifted it then more fool the donor. If it was paid for with donations as some kind of perk of his position then that would be more controversial.
I do agree that there are messages such as those raised by DD but I think it's a question of perspective. Far more hypocritical is the paying of $4000 a day to keep embarrassing documents away from the authorities. Far more hypocritical is the sale of billions of dollars worth of real estate whilst asking for ice cream money to build nice new homes in the US, UK, South Africa without doing anything for the real needs of suffering people on the ground.
Sure, another brother might have been counselled about a showy display of one's means of life and certainly, Sanderson might have shown some discretion but, given we don't have any idea how he came into the owning the watch, the danger is that the indignation can be seen as petty point scoring by those who think all apostates do is scrape around for silly points of contention when there are some really serious issues around how the WTS goes about it's commercial operations and charitable works.