The article is about transporting/supplying batteries on or off a bike and not their actual use by the end user.
"If any company handles, packs and labels dangerous goods, such as Lithium-Ion batteries at their own premises, a trained “Dangerous Goods Advisor” is required onsite to oversee that this is done in full compliance with the rules and to declare the goods safe to travel. If you have no member of staff which has received the above training, you must hire a specialist company to handle, pack and label the goods and to fill out a “Dangerous Goods Note”. It is compulsory for Dangerous Goods shipments to be accompanied by this document"
"If any company handles, packs and labels dangerous goods, such as Lithium-Ion batteries at their own premises, a trained “Dangerous Goods Advisor” is required onsite to oversee that this is done in full compliance with the rules and to declare the goods safe to travel. If you have no member of staff which has received the above training, you must hire a specialist company to handle, pack and label the goods and to fill out a “Dangerous Goods Note”. It is compulsory for Dangerous Goods shipments to be accompanied by this document"