Accessibility for Tuya Smart solutions

Hello all:
Am about to purchase some smart sensors for my house, however, the only brand i can afford right now is Tuya, and it has good aftersale service here,
i contacted Tuya about accessibility, and they assure that not all of there devices are accessible.
do not know what they mean by this? is this just to get read of me for not asking them about this subject?
can anyone that is using Tuya devices can tell me about there accessibility?
Thanks in advance