This is Google’s official broad core update announcement on Sunday, June 2, 2019:
“Tomorrow, we are releasing a broad core algorithm update, as we do several times per year. It is called the June 2019 Core Update. Our guidance about such updates remains as we’ve covered before.
Please see this tweet for more about that:”
Here is the important part of that multi-tweet guidance:
“Sometimes, we make broad changes to our core algorithm. We inform about those because the actionable advice is that there is nothing in particular to “fix,” and we don’t want content owners to mistakenly try to change things that aren’t issues….”
The reason they say there is nothing to fix is because the update is not generally about targeting specific kinds of low quality.
In a general way, these kinds of updates are about improving how Google understands search queries, improving how Google understands web pages and bringing both sides together to provide more relevant search results.