Am I allowed to bump someone else's thread?

If I am, bump. I asked NotATether to consider including both of our threads in his challenge.
As far as I read testnet LND might have trouble finding the node to sync but since I already run my own I should not have any problem right?
You are confusing two separate things. There are Bitcoin nodes and there are Lightning Nodes. If you are on any network (mainnet, testnet), you need both Bitcoin and Lightning nodes to sync from. If your Bitcoin node is running and fully synced, you still need other people's Lightning nodes to sync your own Lightning node to the network. Is that clear?