The link you posted says that most teabags contain PLA, and that they break down during industrial composting, but
However, if your council does not collect your food waste, then these teabags perform no differently than conventional oil-based plastic tea bags.
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PLA stands for Polylactic Acid. PLA teabags are technically not plastic-free, as they are made from plant-based plastics.
PLA bags seem to be better than normal plastic sealed bags, but are still bad. There’s no reason to think that the PLA microplastics will break down, or otherwise act differently if you consume them.
This list is similar but specifically for UK brands, and is more up to date: https://moralfibres.co.uk/the-teabags-without-plastic/
Basically all UK brands are now plastic free. Only Taylors of Harrogate and Waitrose are still holdouts.
The link you posted says that most teabags contain PLA, and that they break down during industrial composting, but
…
PLA bags seem to be better than normal plastic sealed bags, but are still bad. There’s no reason to think that the PLA microplastics will break down, or otherwise act differently if you consume them.