The LA is wasting your time. They have asked you about future plans, when those bear no legal relevance to the question of whether you are providing your child with an adequate education. What matters is what you have done and are doing with him. This is what they should have asked. It would have been sensible for them to have waited until a reasonable amount of time had elapsed so you would have something to report back, but there is nothing to prevent them making informal enquiries whenever they want.
Your reasons for home educating also have no legal relevance. I hope they made it clear that answering such questions was optional? I can see why they might like to collect statistical information on the demographics of home educators in their area, e.g. are there particular schools which children are leaving in droves due to unresolved bullying or unmet special needs, are people deregistering temporarily due to Covid etc. But they have no right to demand that information from you if you don't want to give it.
While LAs are allowed to make informal enquiries, they may not require that parents supply information in any particular format, for example via "chats" on the phone, or form-filling, visits to your home or Zoon calls. It is up to you to decide how to respond. Home educators with legal knowledge recommend submitting a report unless there are unusual circumstances. This allows you to explain your approach better. Phone calls and meetings can be interpreted however the LA likes, you might forget to mention something important, and you cannot later prove who said what. Forms may ask leading questions which don't capture the reality of how you educate your child.
Are you in England? If so, have a read of government guidance to LAs, which tells them how they should interact with home educating families. Your LA appears to be leading you up the garden path by implying that you have to do things which you don't have to do. www.gov.uk/government/publications/elective-home-education
I suggest you write to them specifying that all future correspondence is to be in writing. If they want more information than you have already given them, send a report. The charity Education Otherwise has guides you can download for how to write a report, and will read draft reports from its members to advise whether you need more detail. There is also an excellent huge Facebook group where the admins will give free legal advice and help, even if you are not an EO member. It's here: www.facebook.com/groups/239232119524989 It is for people who are having trouble with their LAs. The fact that there are 17,000 members is a sad indictment of the behaviour of renegade LAs like yours who will not follow government guidance.
How much interference you can expect depends on how much you will put up with, as well as which LA you have. Most LAs will back down when they discover that you know the law and they cannot pull the wool over your eyes. A few will push and push regardless. However, the law is on your side and if you submit a good report there is little they can do.