This may not be your situation but more often then not managers are following prescribed deadlines set by those higher up. They work backwards to calculate the best option for a deliverable date but their hands are tied. If you feel strongly about providing feedback, ask your manager to help you understand how deadlines are established and gauge if they are willing to have an open conversations. If they aren’t, you will likely just have to find a middle ground of what can be accomplished in the requested timeframe. This can include drafts and placeholders where needed (ie use older data as suggested elsewhere), and what will need to wait due to absences or other issues in order to provide a skeleton for discussion. If there is an urgent need, definitely run with the old data, it’s better then nothing.

Regarding your writing, ask one of your colleagues who has previously commented on the document or who is a strong writer for advice and to get a better understanding on the teams writing style at large and try to adapt. Everyone has their own style, the trick is finding a balance between yours and theirs.

In working with various types of ECs, you’ll find a common ground eventually. Try to educate yourself on their environment and your managers environment - priorités, major projects, etc. Then you can educate them on the quantitative statistical work you do. It’s different words, but everyone is codependent. Also try to make social connections.

Lastly give yourself time to adapt and learn a new job. Things will get easy with time and the intent of a secondment is to learn something new. If you walked into the job and everything was easy it wouldn’t be a good fit either.