Is a MOV using high registers (R8-R15) possible with the ARMv6-M architecture?

The ARMv6-M Architecture Reference Manual section "A6.7.40 MOV (register)" on page A6-140 states that the T1 encoding of the MOV instruction is only available on the ARMv6-M architecture if both the source and destination register are from R0-R7. However arm-none-eabi-as assembles the instruction "MOV r15, r14" without any problems:

$ echo 'mov r15,r14' | arm-none-eabi-as -march=armv6-m
$ arm-none-eabi-objdump -d a.out
...
0: 46f7 mov pc, lr

Also, this answer on stackoverflow states that it is possible to acces the high registers on the ARMv6-M architecture.

Could this be a mistake in the reference manual? Or am I reading it wrong?

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