The green “rows” block is an object. And I believe it’s a list of objects, actually. I haven’t worked with it all that much but I think you’ll find this post and this whole topic useful:
One other thing to note is that when you stack blocks that take some time to run such as “delete all rows” or “update value”, the blocks run in parallel. So even though it looks like the blocks you have will delete all rows and then update a value, in reality they will attempt to run at almost the exact same time.
To ensure that the update happens after the rows are deleted, put the “update value” block inside the “delete all rows” block’s “do” section. That block should really say “then do” but it just says “do”.