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None of what you wrote is an accurate description of how Lightning Network works.
Furthermore, A would have to be pretty STUPID to think that he can chargeback by broadcasting tx1. It should be obvious to A that broadcasting tx1 will not help him at all. He has already sent the 10BTC to B and he has no way of getting that value back unless B is STUPID.
If you are engaging in a transaction with someone that you do not have a trust relationship with, you need to take actions (BEFORE YOU SEND THE TRANSACTION) to protect yourself. As an example, perhaps use an escrow provider?
ofcourse its not 'accurate' as i done it in ELI-5 human understanding. if i wrote it at code level i might aswell tell people to just read github
A's hope would be that B would be offline for the timelock period and hope he can spend the 10btc before B realises that B should send tx2
because if A does not act.. B could still transmit tx2 anyway and all is lost. so A might aswell send out tx1 and hope B dosnt notice. (no guarantee it will work but its his only chance)
.. but this proves that LN is not 'trustless' because humans are greedy.
also its pretty stupid to think my post was about A charging back.. my example was where A tried to withdraw funds due to B not honouring a service, however B done a chargeback on A's withdrawal
much like a paypal CUSTOMER doing a withdrawal. but then paypal doing a chargeback against the customer
B is the charge backer... not A.. just B had to make A try to withdraw so that B could trigger the chargeback